Burden of obesity in the Eastern Mediterranean Region: findings from the Global Burden of Disease 2015 study
We used the Global Burden of Disease (GBD) 2015 study results to explore the burden of high body mass index (BMI) in the Eastern Mediterranean Region (EMR).
We estimated the prevalence of overweight and obesity among children (2–19 years) and adults (≥20 years) in 1980 and 2015. The burden of disease related to high BMI was calculated using the GBD comparative risk assessment approach.
The prevalence of obesity increased for adults from 15.1% (95% UI 13.4–16.9) in 1980 to 20.7% (95% UI 18.8–22.8) in 2015. It increased from 4.1% (95% UI 2.9–5.5) to 4.9% (95% UI 3.6–6.4) for the same period among children. In 2015, there were 417,115 deaths and 14,448,548 disability-adjusted life years (DALYs) attributable to high BMI in EMR, which constitute about 10 and 6.3% of total deaths and DALYs, respectively, for all ages.
This is the first study to estimate trends in obesity burden for the EMR from 1980 to 2015. We call for EMR countries to invest more resources in prevention and health promotion efforts to reduce this burden.
KeywordsObesity Burden of disease Eastern Mediterranean Region
High body mass index (BMI), or overweight, is associated with increased morbidity and mortality, and is a major risk factor for diabetes, cancer, cardiovascular diseases, sleep apnea, and poor physical health (Kim et al. 2016; Yao et al. 2017; Kelly et al. 2017; Mehta et al. 2017). It is also associated with an increased risk for psychiatric disorders, including depression (Pratt and Brody 2014; Abou Abbas et al. 2015). A continuous rise in obesity is threatening health improvements in many countries (Sidney et al. 2016; GBD 2015 Obesity Collaborators 2017), while controlling its spread could drastically improve population health (Maciosek et al. 2017).
The increase in overweight and obesity prevalence is a direct result of lifestyle changes due to the social and demographic transition that started several decades ago (Broyles et al. 2015; Mokdad et al. 2016). The Eastern Mediterranean Region (EMR) is facing the same challenges due to rapid economic, demographic, and lifestyle changes, including changes in food consumption, reduced physical activity, and increased sedentary lifestyle (Musaiger et al. 2012; Mokdad et al. 2016). The contribution of high BMI to total DALYs in the EMR had increased in 2013 (7.5% of DALYs) in comparison to 1990 (3.7% of DALYs) (Mokdad et al. 2016). Kuwait, Qatar, and Libya, three EMR countries, were among the top ten countries with highest prevalence of obesity worldwide in 2013, and the man believed to be the heaviest living person was diagnosed in Saudi Arabia (Ng et al. 2014; Terkawi et al. 2014).
The EMR has a population of about 583 million people (World Health Organization 2016). Countries in the EMR vary significantly in terms of their gross domestic product, socio-demographic profiles, health indicators, and health system capacities and coverage. Despite the heavy burden of high BMI in the region, no comprehensive and current estimates of the epidemic exist for the EMR.
To quantify the burden of high BMI in the EMR and its impact on health, we systematically evaluated the trends in prevalence of overweight and obesity as well as the patterns of deaths and DALYs related to high BMI by age and sex, using the results of the Global Burden of Disease (GBD) 2015 study. We also estimated the attributable fraction of high BMI to ischemic heart disease, stroke, and diabetes mellitus, the three leading non-communicable causes of death in EMR, for which high BMI is a risk factor.
The prevalence of overweight and obesity among children (2–19 years) and adults (≥20 years) in 1980 and 2015 was estimated for EMR countries. The EMR countries, based on the World Health Organization classification, are Afghanistan, the Kingdom of Bahrain, Djibouti, the Arab Republic of Egypt, the Islamic Republic of Iran, the Republic of Iraq, the Hashemite Kingdom of Jordan, the State of Kuwait, the State of Lebanon, the State of Libya, the Kingdom of Morocco, the Sultanate of Oman, the Islamic Republic of Pakistan, Palestine, the State of Qatar, the Kingdom of Saudi Arabia, the Federal Republic of Somalia, the Republic of Sudan, the Syrian Arab Republic, the Republic of Tunisia, the United Arab Emirates, and the Republic of Yemen.
The burden of disease related to high BMI was calculated using the GBD comparative risk assessment approach between 1990 and 2015 (Forouzanfar et al. 2015, 2016). A detailed methodology of BMI estimation for GBD 2015 has been published elsewhere (GBD 2015 Obesity Collaborators 2017). Since burden estimations depend on GBD all-cause mortality, burden of high BMI is only available for the period 1990–2015. We used all available data surveys following a systematic search. The search strategy as well as data sources used per country have been published as an appendix elsewhere and are available from the Global Health Data Exchange (Institute for Health Metrics and Evaluation 2016; GBD 2015 Obesity Collaborators 2017). Briefly, Medline was systematically searched for studies providing nationally or subnationally representative estimates of overweight prevalence, obesity prevalence, or mean body mass index (BMI) published between 1 January 2014 and 31 December 2015 to update the GBD 2013 systematic literature search (Ng et al. 2016).
For adults, 127 out of 2036 abstracts identified met inclusion criteria and were extracted. For children, 146 out of 971 articles identified were extracted. In total, 816 articles were included in the analysis. Additionally, the Global Health Data Exchange (GHDx) database was searched for individual-level data from major multinational survey series or country-specific surveys and identified 1026 unique sources meeting the inclusion criteria. Of the 816 articles and 1026 unique sources, all those pertaining to EMR countries were included. The GBD 2015 results tool from the GHDx allows readers to view, country by country, what data sources have been used to produce these estimates (Institute for Health Metrics and Evaluation 2016).
For adults, overweight was defined as 25.0 ≤ BMI ≤ 30 kg/m2, and obesity was defined as BMI ≥30 kg/m2. The International Obesity Task Force definition was used for childhood overweight and obesity (Cole et al. 2000).
Children were defined as individuals 2–19 years of age based on the lowest age for which the International Obesity Task Force provides a definition of overweight and obesity, and the age groups used in GBD modeling, which include 19 in the age group 15–19 (Cole et al. 2000; Wang et al. 2016).
Briefly, a spatiotemporal Gaussian process regression (ST-GPR) was used to estimate the mean prevalence of overweight and obesity (Ng et al. 2014). To improve estimates for countries with sparse data, three country-level covariates with best fit and coefficients in the expected direction were selected: 10-year lag-distributed energy intake per capita, the absolute latitude of the country as proxy for income, and the proportion of people living in urban areas. These covariates have been systematically evaluated in a previous study (Ng et al. 2014).
The Bradford Hill criteria for causation and the World Cancer Research Fund evidence grading criteria were used to systematically evaluate epidemiologic evidence supporting the causal relationship between high BMI and various diseases among adults (≥20 years of age) (Hill 1965; World Cancer Research Fund and American Institute for Cancer Research 2007).
The population-attributable fraction by country, age, sex, and year was calculated to quantify the burden of disease related to high BMI, defined as BMI ≥25 kg/m2, for each disease. Deaths and DALYs related to high BMI for each country, age, sex, year, and cause were computed by multiplying the population-attributable fraction by the total deaths or DALYs estimated in GBD 2015 for that country, age, sex, year, and cause. The total disease burden of high BMI was calculated as the sum of disease-specific burden.
95% uncertainty intervals (UI) for all results were computed using Monte Carlo simulations, keeping 1000 draws of each quantity of interest to propagate uncertainty into final estimates.
Expected estimates were also produced for each country based on its Socio-demographic Index (SDI)—a summary measure of lag-distributed income per capita, average educational attainment over the age of 15 years, and total fertility rate (Forouzanfar et al. 2015). In GBD 2015, SDI was computed by rescaling each component to a scale of zero to one, with zero being the lowest observed educational attainment, lowest income per capita, and highest fertility rate from 1980 to 2015, and one being the highest observed educational attainment, highest income per capita, and lowest fertility rate during that time, and then taking the geometric mean of these values for each location-year.
This study followed the Guidelines for Accurate and Transparent Health Estimates Reporting (GATHER) of the World Health Organization (WHO) regarding documentation of data sources, estimation methods, and statistical analysis (Stevens et al. 2016).
Role of the funding source
The Bill & Melinda Gates Foundation had no role in the development of these methods.
Deaths, with 95% uncertainty intervals (UI), per 100,000 population attributable to high body mass index among those who died from ischemic heart disease, stroke, and diabetes, by age groups (Global Burden of Disease 2015 study, Eastern Mediterranean countries, 1990 and 2015)
Ischemic heart disease
Ischemic heart disease
Ischemic heart disease
Deaths, with 95% uncertainty intervals (UI), per 100,000 population due to high body mass index observed in 1990 and 2015, and expected based on Socio-demographic Index in 2015 (Global Burden of Disease 2015 study, Eastern Mediterranean countries, 1990 and 2015)
United Arab Emirates
Disability-adjusted life years (DALYs) and years lived with disability (YLDs), with 95% uncertainty intervals (UI), per 100,000 population attributable to high body mass index among DALYs and YLDs due to ischemic heart disease, stroke, and diabetes, by age groups (Global Burden of Disease 2015 study, Eastern Mediterranean countries, 1990 and 2015)
Ischemic heart disease
Ischemic heart disease
Ischemic heart disease
Expected versus observed
Disability-adjusted life years, with 95% uncertainty intervals (UI) per 100,000 population due to high body mass index observed in 1990 and 2015, and expected based on Socio-demographic Index in 2015 (Global Burden of Disease 2015 study, Eastern Mediterranean countries, 1990 and 2015)
United Arab Emirates
This is the first study to provide estimates of trends in obesity prevalence, deaths, and DALYs for the EMR from 1980 to 2015. Our study showed that the observed burden for high BMI was higher than expected for most countries in the region based on their SDI levels. Our study calls for renewed efforts to reduce the burden of obesity in the region. Indeed, with further progression of the epidemiologic transition and the growth and aging of the EMR population, high BMI will increase the burden of chronic conditions and disability and put financial and resource strains on the health systems.
High BMI is observed in some poor and rich countries of the EMR. In developed countries such as the United States and France, obesity is higher among low socioeconomic strata of the population (Drewnowski et al. 2014). These patterns in the West are attributable to poor diet and lower physical activity levels. Previous studies have reported similar findings for both socioeconomic status and sex in the EMR (Musaiger 2011a). In the EMR, except for Iran and Lebanon, all high-middle- and high-SDI countries had an obesity prevalence equaling or exceeding 25% for both males and females 20 years or older. Obesity prevalence exceeded 10% among children 2–19 years only in these countries as well, except for Bahrain, Jordan, Lebanon, and Iran. Djibouti and Egypt were the only low- and middle-SDI countries where childhood obesity exceeded 10% for females. These country-level estimates might be masking variations of the epidemic within each of the countries. Indeed, few studies have been done at the country level in the EMR, and these showed a variation in BMI levels between levels of education and income. High BMI was more likely to impact those with low educational levels (Sibai et al. 2003; Memish 2014).
Unfortunately, our estimations for observed obesity burden were higher than expected for the region, and based on SDI, which only deals with socioeconomic inequalities between countries. However, the biggest gaps between the included countries are cultural factors and obesogenic cultural traditions, as well as political instability (wars, civil unrest,) all of which are linked to obesity but not measured by SDI (Ulijaszek 2007). Cultural factors and obesogenic cultural traditions disproportionally affect women, highlighting cross-cutting gender issues in women’s health (Shapira 2013). This might explain the observed gender differences in overweight and obesity. Similarly, social determinants of health in countries in conflict tend to differ as morbidity and mortality are associated with conflict (World Health Organization 2008). More importantly, wars and civil unrest are closely associated with child malnutrition, which in turn is associated with increased risk of obesity, hypertension, cardiovascular disease, and type 2 diabetes (Devakumar et al. 2014; Charchuk et al. 2015). This leads to the intergenerational effects of war on obesity and the doubled burden of undernutrition in countries affected by wars or experiencing chronic civil unrest (Devakumar et al. 2014).
Despite this increase in obesity, EMR countries can hope to control their epidemic as declines in obesity prevalence have been reported in other countries due to health interventions and environmental and policy changes (Schmidt Morgen et al. 2013; Keane et al. 2014). EMR countries can benefit from implementing an array of proven interventions to control their obesity epidemics. Over the last decade, very few EMR ministries of health have focused on health promotion strategies to reduce obesity, such as awareness and behavioral changes. Of the 22 countries in the EMR, only Bahrain, Qatar, and Saudi Arabia had substantial information on combating obesity on their ministry of health websites (Gharib et al. 2012; Saudi Ministry of Health 2012). Qatar and Saudi Arabia launched national campaigns against obesity in 2011 and 2012, respectively. The Saudi campaign focused primarily on dietary awareness, promoting healthy eating choices and emphasizing variety and balance through a food pyramid (Hamad Al-Dkheel 2012). The Qatar campaign was more comprehensive, setting up programs to increase physical activity, replace school snacks with healthier options, and pilot a nutrition surveillance system in addition to a dietary awareness campaign (Mohammed Al-Thani 2011). Indeed, and despite the campaign in Qatar, obesity prevalence is one of the highest in the region, suggesting the need for a more aggressive approach.
Promoting healthier lifestyles around nutrition and physical activity is greatly needed in this region. As pointed out previously, possible factors determining obesity in the EMR include nutrition transition, inactivity, urbanization, marital status, a shorter duration of breastfeeding, frequent snacking, skipping breakfast, a high intake of sugary beverages, an increase in the incidence of eating outside the home, long periods of time spent viewing television, massive marketing promotion of high-fat foods, stunting, perceived body image, cultural elements, and food subsidy policies (Musaiger 2011b).
Indeed, estimates from the GBD study show an increase in dietary risk factors and low levels of physical activity (Forouzanfar et al. 2016). What the EMR populations consume can be directly affected by national policies, specifically those around food economics. For instance, in many EMR countries such as Egypt, Morocco, and Saudi Arabia, governments subsidize grains, bread, wheat flour, sugar, and cooking oil, and impose taxes on imported foods (Asfaw 2007; Musaiger 2011b). However, fruits and vegetables are neither subsidized nor exempt from import taxes, making healthier food choices harder for the population. As for physical activity, the lack of exercise facilities has been reported, at least in Egypt and Saudi Arabia, as the main reason for low physical activity (Al-Rafaee and Al-Hazzaa 2001; El-Gilany et al. 2011).
This study has a few limitations. These include possible underestimation of the prevalence of obesity or disease burden from high BMI as self-reported height and weight data were used. However, we corrected these based on measured data at each age, sex, and country unit (GBD 2015 Obesity Collaborators 2017). Briefly, no significant difference between measured and self-reported data for children was found. For adults, self-reported data were adjusted for overweight prevalence, obesity prevalence, and mean BMI using nested hierarchical mixed-effects regression models, fit using restricted maximum likelihood separately by sex. Second, estimates for some countries with sparse data were driven by covariates in the statistical modeling. This, in fact, highlights the need for more timely surveillance data on BMI and risk factors in the EMR. Better quality data in the EMR for quantification of morbidity and mortality burden and health policy planning is urgently needed. Third, the attributable effect of BMI on ischemic heart disease, stroke, and diabetes was derived from prospective observational studies and meta-analyses, and hence does not account for differences by ethnicity, or for underlying diseases (Global BMI Mortality Collaboration et al. 2016). While these observational studies are not specifically from the EMR, the attributable effect of BMI on the three diseases has been shown to remain the same across different regions from the world (Singh et al. 2013). Fourth, BMI presents some drawbacks as it is a measure of excess weight rather excess body fat (Daniels 2009). The relationship between BMI and body fat can be influenced by age, sex, ethnicity, and muscle mass. In addition, BMI does not indicate whether excess weight is due to fat, muscle, or bone (Daniels 2009). However, BMI is favored for its ease of use in surveys and is the most available indicator regarding excess weight. More details on this study’s limitations are available elsewhere (GBD 2015 Obesity Collaborators 2017).
This study showed that high BMI creates a major burden in the EMR. We call for countries in the region to invest more resources in prevention and health promotion efforts to reduce the prevalence of obesity. These programs should focus on stopping weight gain as a first step and more aggressive programs to reduce weight among those who need to do so. These programs should take into account the culture and local environment. Moreover, countries should join efforts in their programs and policies and share experiences and success stories.
GBD 2015 Eastern Mediterranean Region Obesity Collaborators:
Charbel El Bcheraoui, PhD, Institute for Health Metrics and Evaluation, University of Washington. Ashkan Afshin, MD, Institute for Health Metrics and Evaluation, University of Washington, Seattle, WA, United States. Raghid Charara, MD, American University of Beirut, Beirut, Lebanon. Ibrahim Khalil, MD, Institute for Health Metrics and Evaluation, University of Washington, Seattle, Washington, United States. Maziar Moradi-Lakeh, MD, Department of Community Medicine, Preventive Medicine and Public Health Research Center, Gastrointestinal and Liver Disease Research Center (GILDRC), University of Medical Sciences, Tehran, Iran. Nicholas J. Kassebaum, MD, Institute for Health Metrics and Evaluation, University of Washington, Seattle, Washington, United States; Department of Anesthesiology & Pain Medicine, Seattle Children's Hospital, Seattle, Washington, United States. Michael Collison, BS, Institute for Health Metrics and Evaluation, University of Washington, Seattle, Washington, United States. Farah Daoud, BA/BS, Institute for Health Metrics and Evaluation, University of Washington, Seattle, Washington, United States. Kristopher J. Krohn, BA, Institute for Health Metrics and Evaluation, University of Washington, Seattle, Washington, United States. Adrienne Chew, ND, Institute for Health Metrics and Evaluation, University of Washington, Seattle, Washington, United States. Stan H. Biryukov, BS, Institute for Health Metrics and Evaluation, University of Washington, Seattle, Washington, United States. Leslie Cornaby, BS, Institute for Health Metrics and Evaluation, University of Washington, Seattle, Washington, United States. Kyle J. Foreman, PhD, Institute for Health Metrics and Evaluation, University of Washington, Seattle, Washington, United States; Imperial College London, London, United Kingdom. Michael Kutz, BS, Institute for Health Metrics and Evaluation, University of Washington, Seattle, Washington, United States. Patrick Liu, BA, Institute for Health Metrics and Evaluation, University of Washington, Seattle, Washington, United States. Marissa Reitsma, BS, Institute for Health Metrics and Evaluation, University of Washington, Seattle, Washington, United States. Patrick Sur, BA, Institute for Health Metrics and Evaluation, University of Washington, Seattle, Washington, United States, Seattle. Haidong Wang, PhD, Institute for Health Metrics and Evaluation, University of Washington, Seattle, Washington, United States. Ben Zipkin, BS, Institute for Health Metrics and Evaluation, University of Washington, Seattle, Washington, United States, Seattle. Johan Ärnlöv, PhD, Department of Neurobiology, Care Sciences and Society, Division of Family Medicine and Primary Care, Karolinska Institutet, Stockholm, Sweden; School of Health and Social Studies, Dalarna University, Falun, Sweden. Cristiana Abbafati, PhD, La Sapienza, University of Rome, Rome, Italy. Abdishakur M. Abdulle, PhD, New York University Abu Dhabi, Abu Dhabi, United Arab Emirates. Niveen M.E. Abu-Rmeileh, PhD, Institute of Community and Public Health, Birzeit University, Ramallah, West Bank, Palestine. Muktar Beshir Ahmed, MPH, College of Health Sciences, Department of Epidemiology, ICT and e-Learning Coordinator, Jimma University, Jimma, Oromiya, Ethiopia. Ziyad Al-Aly, MD, Washington University in St. Louis, St. Louis, MO, United States. Khurshid Alam, PhD, Murdoch Childrens Research Institute, The University of Melbourne, Parkville, Victoria, Australia; The University of Melbourne, Melbourne, VIC, Australia; The University of Sydney, Sydney, NSW, Australia. Reza Alizadeh-Navaei, PhD, Gastrointestinal Cancer Research Center, Mazandaran University of Medical Sciences, Sari, Mazandaran, Iran. Ala'a Alkerwi, PhD, Luxembourg Institute of Health (LIH), Strassen, Luxembourg. Khalid A. Altirkawi, MD, King Saud University, Riyadh, Saudi Arabia. Nelson Alvis-Guzman, PhD, Universidad de Cartagena, Cartagena de Indias, Colombia. Bernhard T. Baune, PhD, School of Medicine, University of Adelaide, Adelaide, South Australia, Australia. Neeraj Bedi, MD, College of Public Health and Tropical Medicine, Jazan, Saudi Arabia. Derrick A. Bennett, PhD, Nuffield Department of Population Health, University of Oxford, Oxford, United Kingdom. Addisu S. Beyene, MPH, College of Health and Medical Science, Haramaya University, Harar, Ethiopia. Zulfiqar A. Bhutta, PhD, Centre of Excellence in Women and Child Health, Aga Khan University, Karachi, Pakistan; Centre for Global Child Health, The Hospital for Sick Children, Toronto, ON, Canada. Mulugeta M. Birhanu, MS, University of Groningen, UMCG, Groningen, Groningen, Netherlands; Mekelle University, Mekelle, Ethiopia. Hadi Danawi, PhD, Walden University, Minneapolis, Minnesota, United States. Seyed-Mohammad Fereshtehnejad, PhD, Department of Neurobiology, Care Sciences and Society (NVS), Karolinska Institutet, Stockholm, Sweden. Florian Fischer, PhD, School of Public Health, Bielefeld University, Bielefeld, Germany. Tsegaye Tewelde Gebrehiwot, MPH, Jimma University, Jimma, Oromia, Ethiopia. Paramjit Singh Gill, DM, Warwick Medical School, University of Warwick, Coventry, United Kingdom; University of Birmingham, UK, Birmingham, United Kingdom. Philimon N. Gona, PhD, University of Massachusetts Boston, Boston, Massachusetts, United States. Vipin Gupta, PhD, Department of Anthropology, University of Delhi, Delhi, Delhi, India. Tesfa Dejenie Habtewold, MS, University of Groningen, Groningen, Netherlands; Debre Berhan University, Debre Berhan, Ethiopia. Randah Ribhi Hamadeh, DPhil, Arabian Gulf University, Manama, Bahrain. Samer Hamidi, DrPH, Hamdan Bin Mohammed Smart University, Dubai, United Arab Emirates. Habtamu Abera Hareri, MS, Addis Ababa University, Addis Ababa, Ethiopia. Masako Horino, MPH, Bureau of Child, Family & Community Wellness, Nevada Division of Public and Behavioral Health, Carson City, NV, United States. Mohamed Hsairi, MD, Department of Epidemiology, Salah Azaiz Institute, Tunis, Tunis, Tunisia. Mehdi Javanbakht, PhD, University of Aberdeen, Aberdeen, Aberdeen, United Kingdom. Denny John, MPH, International Center for Research on Women, New Delhi, Delhi, India. Jost B. Jonas, MD, Department of Ophthalmology, Medical Faculty Mannheim, Ruprecht-Karls-University Heidelberg, Mannheim, Germany. Vasna Joshua, PhD, National Institute of Epidemiology, Indian Council of Medical Research, Chennai, India. Amir Kasaeian, PhD, Hematology-Oncology and Stem Cell Transplantation Research Center, Tehran University of Medical Sciences, Tehran, Iran; Endocrinology and Metabolism Population Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran. Ezra B. Ketema, MS, Mekelle University, Mekelle, Ethiopia. Yousef Saleh Khader, ScD, Department of Community Medicine, Public Health and Family Medicine, Jordan University of Science and Technology, Irbid, Irbid, Jordan. Ejaz Ahmad Khan, MD, Health Services Academy, Islamabad, Punjab, Pakistan. Jagdish Khubchandani, PhD, Department of Nutrition and Health Science, Ball State University, Muncie, Indiana, United States. Daniel Kim, DrPH, Department of Health Sciences, Northeastern University, Boston, Massachusetts, United States. Yun Jin Kim, PhD, Faculty of Chinese Medicine, Southern University College, Skudai, Johor, Malaysia. Yohannes Kinfu, PhD, Centre for Research and Action in Public Health, University of Canberra, Canberra, Australian Capital Territory, Australia. Yoshihiro Kokubo, PhD, Department of Preventive Cardiology, National Cerebral and Cardiovascular Center, Suita, Osaka, Japan. Heidi J. Larson, PhD, Department of Infectious Disease Epidemiology, London School of Hygiene & Tropical Medicine, London, United Kingdom; Institute for Health Metrics and Evaluation, University of Washington, Seattle, Washington, United States. Paul H. Lee, PhD, Hong Kong Polytechnic University, Hong Kong, China. Raimundas Lunevicius, PhD, Aintree University Hospital National Health Service Foundation Trust, Liverpool, United Kingdom; School of Medicine, University of Liverpool, Liverpool, United Kingdom. Hassan Magdy Abd El Razek, MBBCH, Mansoura Faculty of Medicine, Mansoura, Egypt. Mohammed Magdy Abd El Razek, MBBCH, Aswan University Hospital, Aswan Faculty of Medicine, Aswan, Egypt. Reza Malekzadeh, MD, Digestive Diseases Research Institute, Tehran University of Medical Sciences, Tehran, Iran. Kedar K. Mate, MSc, McGill University, Montreal, Quebec, Canada. Ziad A. Memish, MD, Saudi Ministry of Health, Riyadh, Saudi Arabia; College of Medicine, Alfaisal University, Riyadh, Saudi Arabia. Mubarek Abera Mengistie, MS, Jimma University, Jimma, Oromia, Ethiopia. George A. Mensah, MD, Center for Translation Research and Implementation Science, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, United States. Felix Akpojene Ogbo, MPH, Centre for Health Research, Western Sydney University, Sydney, New South Wales, Australia. Farshad Pourmalek, PhD, University of British Columbia, Vancouver, British Columbia, Canada. Anwar Rafay, MS, Contech International Health Consultants, Lahore, Punjab, Pakistan; Contech School of Public Health, Lahore, Punjab, Pakistan. Mostafa Qorbani, PhD, Non-communicable Diseases Research Center, Alborz University of Medical Sciences, Karaj, Iran. Vafa Rahimi-Movaghar, MD, Sina Trauma and Surgery Research Center, Tehran University of Medical Sciences, Tehran, Tehran, Iran. Saleem M. Rana, PhD, Contech School of Public Health, Lahore, Punjab, Pakistan; Contech International Health Consultants, Lahore, Punjab, Pakistan. Salman Rawaf, MD, Imperial College London, London, United Kingdom. Andre M.N. Renzaho, PhD, Western Sydney University, Penrith, NSW, NSW, Australia. Satar Rezaei, PhD, School of Public Health, Kermanshah University of Medical Sciences, Kermanshah, Iran. Mohammad Sadegh Rezai, MD, Infectious Disease Research Centre with Focus on Nosocomial Infection, Mazandaran University of Medical Sciences, Sari, Mazandaran, Iran. Mahdi Safdarian, MD, Sina Trauma & Surgery Research Center, Tehran University of Medical Sciences, Tehran, Iran. Mohammad Ali Sahraian, MD, MS Research Center, Neuroscience Institute, Tehran University of Medical Sciences, Tehran, Iran. Payman Salamati, MD, Sina Trauma and Surgery Research Center, Tehran University of Medical Sciences, Tehran, Tehran, Iran. Abdallah M. Samy, PhD, Ain Shams University, Cairo, Egypt. Juan Ramon Sanabria, MD, J Edwards School of Medicine, Marshall Univeristy, Huntington, WV, United States; Case Western Reserve University, Cleveland, OH, United States. Milena M. Santric Milicevic, PhD, Institute of Social Medicine, Faculty of Medicine, University of Belgrade, Serbia, Serbia; Centre School of Public Health and Health Management, Faculty of Medicine, University of Belgrade, Serbia, Serbia. Benn Sartorius, PhD, Public Health Medicine, School of Nursing and Public Health, University of KwaZulu-Natal, Durban, South Africa; UKZN Gastrointestinal Cancer Research Centre, South African Medical Research Council (SAMRC), Durban, South Africa. Sadaf G. Sepanlou, PhD, Digestive Diseases Research Institute, Tehran University of Medical Sciences, Tehran, Tehran, Iran. Masood Ali Shaikh, MD, Independent Consultant, Karachi, Pakistan. Rahman Shiri, PhD, Finnish Institute of Occupational Health, Work Organizations, Work Disability Program, Department of Public Health, Faculty of Medicine, University of Helsinki, Helsinki, Finland. Diego Augusto Santos Silva, PhD, Federal University of Santa Catarina, Florianopolis, Brazil. Jasvinder A. Singh, MD, University of Alabama at Birmingham and Birmingham Veterans Affairs Medical Center, Birmingham, Alabama, United States. Abdullah Sulieman Terkawi, MD, Department of Anesthesiology, University of Virginia, Charlottesville, VA, United States; Department of Anesthesiology, King Fahad Medical City, Riyadh, Saudi Arabia; Outcomes Research Consortium, Cleveland Clinic, Cleveland, OH, United States. Tenaw Yimer Tiruye, MPH, Debre Markos University, Debre Markos, Ethiopia. Kingsley Nnanna Ukwaja, MD, Department of Internal Medicine, Federal Teaching Hospital, Abakaliki, Ebonyi State, Nigeria. Tommi Vasankari, PhD, UKK Institute for Health Promotion Research, Tampere, Finland. Vasiliy Victorovich Vlassov, MD, National Research University Higher School of Economics, Moscow, Russia. Tolassa Wakayo, MS, Jimma University, Jimma, Oromia, Ethiopia. Andrea Werdecker, PhD, Competence Center Mortality-Follow-Up of the German National Cohort, Federal Institute for Population Research, Wiesbaden, Hessen, Germany. Naohiro Yonemoto, MPH, Department of Biostatistics, School of Public Health, Kyoto University, Kyoto, Japan. Mustafa Z. Younis, DrPH, Jackson State University, Jackson, MS, United States. Bassel Zein, MS, Department of Neuroscience, Georgetown University, Washington DC, United States. Aisha O. Jumaan, PhD, Independent Consultant, Seattle, Washington, United States. Theo Vos, PhD, Institute for Health Metrics and Evaluation, University of Washington, Seattle, Washington, United States. Simon I. Hay, DSc, Oxford Big Data Institute, Li Ka Shing Centre for Health Information and Discovery, University of Oxford, Oxford, United Kingdom; Institute for Health Metrics and Evaluation, University of Washington, Seattle, Washington, United States. Mohsen Naghavi, PhD, Institute for Health Metrics and Evaluation, University of Washington, Seattle, Washington, United States. Christopher J. L. Murray, DPhil, Institute for Health Metrics and Evaluation, University of Washington, Seattle, Washington, United States. Ali H. Mokdad, PhD, Institute for Health Metrics and Evaluation, University of Washington, Seattle, Washington, United States.
Compliance with ethical standards
This manuscript reflects original work that has not previously been published in whole or in part and is not under consideration elsewhere. All authors have read the manuscript and have agreed that the work is ready for submission and accept responsibility for its contents. The authors of this paper have complied with all ethical standards and do not have any conflicts of interest to disclose at the time of submission. The funding source played no role in the design of the study, the analysis and interpretation of data, and the writing of the paper. The study did not involve human participants and/or animals; therefore, no informed consent was needed.
This research was funded by the Bill & Melinda Gates Foundation.
Conflict of interest
The authors declare that they have no conflicts of interest at this time.
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