Abstract
Background
Medication errors are a significant global concern and can cause serious medical consequences for patients. Little is known about medication errors in Middle Eastern countries. The objectives of this systematic review were to review studies of the incidence and types of medication errors in Middle Eastern countries and to identify the main contributory factors involved.
Methods
A systematic review of the literature related to medication errors in Middle Eastern countries was conducted in October 2011 using the following databases: Embase, Medline, Pubmed, the British Nursing Index and the Cumulative Index to Nursing & Allied Health Literature. The search strategy included all ages and languages. Inclusion criteria were that the studies assessed or discussed the incidence of medication errors and contributory factors to medication errors during the medication treatment process in adults or in children.
Results
Forty-five studies from 10 of the 15 Middle Eastern countries met the inclusion criteria. Nine (20 %) studies focused on medication errors in paediatric patients. Twenty-one focused on prescribing errors, 11 measured administration errors, 12 were interventional studies and one assessed transcribing errors. Dispensing and documentation errors were inadequately evaluated. Error rates varied from 7.1 % to 90.5 % for prescribing and from 9.4 % to 80 % for administration. The most common types of prescribing errors reported were incorrect dose (with an incidence rate from 0.15 % to 34.8 % of prescriptions), wrong frequency and wrong strength. Computerised physician rder entry and clinical pharmacist input were the main interventions evaluated. Poor knowledge of medicines was identified as a contributory factor for errors by both doctors (prescribers) and nurses (when administering drugs). Most studies did not assess the clinical severity of the medication errors.
Conclusion
Studies related to medication errors in the Middle Eastern countries were relatively few in number and of poor quality. Educational programmes on drug therapy for doctors and nurses are urgently needed.
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Introduction
The Middle Eastern region is strategically, politically and economically important for the whole world. There are fifteen countries between western Asia and northern Africa which make up the Middle Eastern region [1]. Economically, Middle Eastern countries are ranked by the World Bank according to their gross domestic product (GDP) on purchasing power parity (PPP) per capita. The high-income countries (HIC) include Qatar, the United Arab Emirates (U.A.E), Bahrain, Saudi Arabia, Kuwait, Israel and Oman. The upper-middle income countries (UMIC) are Iran, Jordan and Lebanon. The lower-middle iome countries (LMIC) are Egypt, Palestine, Syria, Yemen and Iraq [1]. The population of the Middle Eastern countries is approximately 300 million, with a population growth rate of 1.86 %. Elderly people of 65 years or over represent 3.63 % of the total population of Middle Eastern people [2]. The International Diabetes Foundation estimates that 26.6 million adults (8.6 % of the population) in the Middle East and North Africa currently have diabetes [3]. Obesity rates in the Middle East and North Africa are also among the highest in the world, particularly in the Gulf countries.
Medication errors (MEs) are under-reported in all countries [4], particularly in developing countries. MEs present a universal problem and can cause serious consequences for patients, especially those with acute complex medical conditions [5]. The National Patient Safety Agency revealed that MEs in all care settings in the UK occurred in each stage of the medication treatment process, with 16 % in prescribing, 18 % in dispensing and 50 % in administration of drugs [6].
For paediatric MEs it has been estimated that 3–37 % occur during prescribing, 5–58 % during dispensing, 72–75 % during administration, and 17–21 % are documentation errors [7]. Over an 8-year period in the UK, at least 29 children died due to MEs [8]. Safe drug therapy for children is a major issue in many low-income countries (LIC) and LMIC in the south [9].
Most of the research on MEs has been conducted in HIC in the USA and Europe. Information on the incidence of MEs in LIC and LMIC is limited. In our current research, we have focused on Middle Eastern countries in order to explore and highlight the problem of MEs in this region. There are a variety of reasons why MEs may be different in this region. These include the training of health professionals in clinical pharmacology, differences in relation to the role of clinical pharmacists, and the types of medicines prescribed, alongside cultural issues.
This systematic literature review therefore aimed to identify and review studies of the incidence and types of MEs in Middle Eastern countries, and identify the main contributing factors.
Methods
Search strategy
A systematic review of literature relating to MEs in prescribing, transcribing, dispensing, administration and documentation in adults and children in Middle Eastern countries was conducted in October 2011. The following electronic databases were searched: Embase (1980 – October 2011), Medline (1948 – October 2011), Pubmed (until October 2011), the British Nursing Index (1985 – October 2011) and the Cumulative Index to Nursing & Allied Health Literature (CINAHL) (1982 – October 2011). The search strategy included all ages, all languages, and all types of trials and studies. References from eligible articles were also hand-searched in order to identify additional relevant papers.
Search terms
The following keywords were used as search terms: medication error(s), prescribing error(s), dispensing error(s), administration error(s), documentation error(s), transcribing error(s), medication mistake(s), drug mistake(s), prescribing mistake(s), dispensing mistake(s), administration mistake(s), transcribing mistake (s), wrong medication, wrong drug(s), wrong dose(s), wrong route of administration, wrong calculation(s), physician(s), pharmacist(s) and nurse(s). Each of these key words were combined using “OR” then combined using “AND” with Middle East and also with the names of the appropriate countries (15 countries).
Review procedure
From previous systematic reviews of MEs, studies have been found to be heterogeneous, as they were conducted in different countries used different definitions and different methods to collect data [10, 11]. For this reason we did not try to analyse the data from a statistical viewpoint, but the results are summarised according to the type of MEs.
Inclusion/exclusion criteria
We included all types of studies, i.e., randomised controlled trials, non-randomised controlled trials, longitudinal studies, cohort or case–control studies, and descriptive studies that reported the incidence of medication errors or identified the causes of MEs in the Middle East countries, either in adults or children. We excluded reviews, letters, conference papers, opinions, reports or editorial papers.
Quality assessment
A quality assessment of the identified studies was performed. All relevant studies were reviewed according to 12 criteria adapted from two previous studies [11, 12]. The criteria were adapted to apply to any type of MEs study. Additionally, we evaluated or assessed the documented ethical approval obtained for each study. We therefore evaluated the papers according to the following 13 criteria:
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1.
Aims/objectives of the study clearly stated.
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2.
Definition of what constitutes a medication error.
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3.
Error categories specified.
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4.
Error categories defined.
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5.
Presence of a clearly defined denominator.
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6.
Data collection method described clearly.
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7.
Setting in which study conducted described.
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8.
Sampling and calculation of sample size described.
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9.
Reliability measures.
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10.
Measures in place to ensure that results are valid.
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11.
Limitations of study listed.
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12.
Mention of any assumptions made.
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13.
Ethical approval.
Results
Search results
The results of this search strategy can be found in Fig. 1. More than 5,000 articles were excluded, as the papers were either not related to the specified countries or not relevant to MEs. This left 204 articles for full-text review. A further 163 articles were excluded because they were not relevant to the topic, not related to the specified countries or were opinion articles, letters, editorials and reports.
Forty-one articles were identified as relevant. Four additional relevant studies were identified after hand-searching of the references of these studies. Forty-five articles were therefore finally relevant and are included in this systematic review (Fig. 1). The abstracts of four studies were in English but the full texts were in foreign languages (3 in Persian and 1 in Hebrew), and those papers were translated into the English language.
Countries with data
The 45 studies provided data for 10 of the 15 countries of the traditional Middle East (Fig. 2). These included 13 studies in Iran, 10 studies in Israel and 9 studies in Saudi Arabia. There was no available data on MEs in the following countries: Yemen, Kuwait, Iraq, Oman and Syria.
Quality assessment of studies
After the application of the quality assessment criteria which were modified to apply to any type of MEs study, no study met all the 13 criteria. Only one study fulfilled 10 criteria, three studies met 9 criteria, and five met 8 criteria. The remaining studies met less than 7 criteria (Fig. 3). Ten of the 45 studies did not specify the type of MEs and 14 of the 45 studies did not clearly state whether or not ethical approval was obtained.
Types of medication error studies
Twenty-one of the 45 studies assessed prescribing errors (Table 1). Most (seven) of these studies were conducted in Saudi Arabia and in Israel (five). One study assessed transcribing errors (Table 2). Eleven studies measured medication administration errors (Table 3) and most of these studies were performed in Iran. Tables 4 and 5 contain the 12 intervention studies that have been performed in Middle Eastern countries for adults and paediatric patients. Four of these studies were conducted in Israel. No studies were identified which evaluated dispensing errors and documentation errors in Middle East countries. Nine (20 %) studies out of the 45 studies focused on MEs in paediatric patients.
Incidence of medication errors
The incidence of MEs in this review is difficult to compare between studies because different methodologies and different definitions were used. We classified our results according to where they occurred during the medication treatment process, i.e., prescribing, transcribing and administration (Fig. 4).
Prescribing errors
Prescribing errors have been defined as MEs initiated during the prescribing process. These include the incorrect selection of medication, wrong dose, wrong strength, wrong frequency, incorrect route of administration, inadequate instruction for use of a medication and wrong dosage form [13]. Twenty-one (46 %) of the studies reported MEs that occurred during the prescribing stage of the medication process (Table 1). Eight studies identified in this review used the above definition [14–21], while the remaining studies did not clearly state a definition of prescribing errors. Thirteen were prospective studies and were conducted in six countries [14–20, 22–27]. Five were retrospective studies [21, 28–31], and the remaining three studies were questionnaires [32–34]. Four studies assessed prescribing errors in children [16, 17, 21, 29].
Estimates of the results were difficult to compare between studies because rates of error were expressed differently. Al-Khaja et al. reported the highest error rate, which was 90.5 % of prescriptions in a primary health care centre [16], while the lowest rate, reported by Al-Dhawailie, was 7.1 % of prescriptions in a teaching hospital [26]. The most common types of prescribing errors reported among the Middle Eastern countries were incorrect dose, wrong frequency and wrong strength. This systematic review revealed that the percentage of dosing errors that were reported during medication prescribing ranged from 0.15 % to 34.8 % of the prescriptions (Table 6).
Transcribing errors
One prospective study of transcription errors using a direct observational method was performed in Iran (Table 2) [35]. Transcribing errors were defined as any deviation in transcribing a medication order from the previous step. This study used a direct observation method of the transcribing process. The transcribing process involved prescriptions being either transferred to the hospital pharmacy or dispensed from ward-based stocks. When prescriptions were sent to the pharmacy, all the information was transcribed into the pharmacy information system. The pharmacy staff then filled, checked and dispatched the drugs to the ward. The observation process included review of each medication order on the order sheet, its transcription, administration nursing note and documentation of its prescriptions to the pharmacy database. The study result revealed that over 50 % of omission errors occurred at transcription stage.
Administration errors
Administration errors have been defined as a discrepancy between the drug therapy received by the patient and that intended by the prescriber or according to standard hospital policies and procedures [36, 37]. Three studies used this definition [38–40], while the remaining eight studies mainly used general definitions of MEs rather than a medication administration error definition. Two were prospective studies (Table 3) [38, 39]. One was an observational study in Iran which assessed the administration of intravenous drugs [38]. The other study, in Israel, used a variety of methods (observations, interviews and administrative data) [39]. The variation between the studies in definitions and methods used for data collection made comparisons difficult. The study that defined errors in preparation and administration, found that the error rates were higher in the administration process compared to the preparation process for intravenous medications, and within the administration process the technique of administration of bolus injection was the most common error (43.4 %) [38].
Two were retrospective studies [41, 42]. Seven were questionnaire studies of nurses’ perceptions of administration errors [40, 43–48]. The reported administration error rates ranged from 9.4 % to 80 % [38, 41]. Saab et al. reviewed patient records and confirmed their results through interviews with patients [41]. They found that the use of an inappropriate drug was higher when patients used both over-the-counter (OTC) and prescription medicines [41]. Sadat-Ali and colleagues assessed the prevalence and characteristics of MEs in patients admitted to a teaching hospital [42]. The authors found that the prevalence of MEs was low (1.58 per 1000 admission). This is likely due to the method used in the study, which was a retrospective review of incident reports—notorious for underestimation of error rates [42]. In addition, the authors revealed that most of the MEs (50 %) occurred during the night shift [42]. Seven questionnaire studies were conducted (5 in Iran and 2 in Jordan). All these studies evaluated nurses and student nurses opinion about the drug administration errors in their area of work [40, 43–48] (Table 3).
Interventional studies
Twelve (27 %) studies were identified describing interventions used to reduce MEs [49–60]. Of these, seven interventions were implemented in adult patients (Table 4) [49–55], and five interventions in paediatric and neonatal patients (Table 5) [56–60]. The interventions had been evaluated in studies from 3 months to 3 years, and most studies involved a comparison of computerised drug order entry systems, with or without clinical decision support systems (CDSS), and/or with handwritten prescriptions. The outcomes for all interventions were positive and led to the prevention and reduction of MEs.
Four interventional studies examined the role of the clinical pharmacist in reducing MEs [51–54]. All these studies were in adult patients only. These interventions led to a significant reduction in the number of MEs. Most of the errors detected were in the prescribing stage. Incorrect drug dosing, incorrect drug choice and drug interactions were the most common errors detected by clinical pharmacists. One of the intervention studies used a self-reported questionnaire designed to collect data after the clinical pharmacists established training and educational materials for inpatient nurses about MEs. No ME data was actually observed or collected [51].
In paediatric and neonatal patients, computerised physician order entry interventions, with and without CDSS, was the most commonly used intervention. All interventions that were implemented in paediatric patients found that medication error rates decreased after the CDSS was added to the computerised physician order entry system [56, 57, 59].
In addition, one study among the interventional studies in paediatric patients was conducted to compare two medication order entry methods: the physician order entry (POE) and nurse order entry [58]. The authors found that the error rates decreased within the NOE period compared to the errors within the POE period [58].
Types of errors
Incorrect dose was the most common type of error reported in 12 studies [14–21, 24, 26, 27, 30]. The dose error rates were reported from 0.15 % to 34.8 % of prescriptions errors (Table 6). Other studies included wrong frequency errors [16, 17], wrong strength [15, 16, 20, 25, 31], wrong or without dosage form [15, 16, 24, 27] and wrong duration of therapy [15, 16, 24, 27].
Medications involved
Differences in the reporting of medications between studies were apparent; some studies involved the medication names, and others listed only the therapeutic class. Most of the errors were related to antihistamine drugs [16, 22, 27], antibiotic medications [14, 23, 38, 60] and anticoagulant drugs [45, 54, 60]. In addition, medications reported in studies conducted on paediatric patients found that antihistamines, paracetamol, electrolytes and bronchodilator drugs were the most common drugs associated with errors [16, 30].
Severity of reported medication errors
The majority of studies did not assess the clinical consequences of reported MEs. Six (13 %, 6/45) attempted to classify the severity of the MEs [14, 21, 26, 30, 31, 38] (Table 7). Only one study reported the severity of the MEs in detail, but was a retrospective study [21]. Two other studies were retrospective [30, 31], while the other three were prospective studies [14, 26, 38]. One study reported 26 deaths and felt that MEs were a contributory factor [31].
Factors contributing to medication errors
The determination of factors contributing to MEs is an important aspect of this review because preventing MEs from reaching the patient depends on a sound knowledge of the causes or contributing factors. The factors contributing to MEs were reported in 12 studies [15, 16, 19, 21, 26, 27, 31, 40, 42, 45–47]. The most common factors reported in this review were as follows:
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Lack of knowledge of prescribing skills.
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Lack of pharmacological knowledge of physicians and nurses.
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Poor compliance with drug prescribing and administration guidelines.
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Lack of reporting of MEs.
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Heavy workload and new staff.
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Miscommunications between health care professionals.
In general, poor knowledge of medicine prescribing and administration was the most common reported contributory factor of MEs in Middle Eastern countries [15, 16, 26, 31, 45, 47].
Discussion
The aim of this systematic review was to review studies of the incidence and types of MEs in Middle Eastern countries and to identify the main contributory factors involved. MEs are an important variable in determining patient safety. This review showed that there have been relatively few studies of MEs in the Middle East compared to the number from the US and Europe [61]. To our knowledge, no previous systematic review has evaluated MEs in Middle Eastern countries. Additionally, the quality of the studies in the Middle East was poor. Poor knowledge of clinical pharmacology was a major factor in many of the papers. This systematic literature review has shown that the scientific literature on MEs published in Middle Eastern countries is limited. No information was available on five of the countries included in the review. Many studies focused mainly on adult patients.
Prescribing errors
Many differences were found with regard to how the studies obtained and reported data. Most of the studies in Middle Eastern countries evaluated MEs during the prescribing stage. The reported incidence of prescribing errors in this review ranged from 7.1 % to 90.5 % of medication orders. A high rate of prescribing errors is known to be an international problem [61, 62]. In a previous systematic review conducted in the UK to identify the prevalence, incidence and nature of prescribing errors in hospital inpatients, prescribing errors were found to be a common occurrence [61], and this is consistent with our findings. The incidence of prescribing errors in that review were 2–14 % of medication orders [61], which was lower than that found in our review of MEs in Middle Eastern countries. However, another study in the UK found that prescribing error rates vary widely, ranging from 0.3 % to 39.1 % of medication orders [63]. It is possible that the incidence rate of prescribing errors in the Middle Eastern countries is higher than that reported in other countries in the world, for example in the UK, but it could also be due to methodological differences.
Transcribing errors
Although some studies classified the transcribing stage as the third most important area in the medication treatment process, Lisby et al. identified the transcribing stage as the area in which most errors occur [64]. In our review only one study assessed transcribing errors, and found that over 50 % of omission errors occurred at transcription stage; this is consistent with other studies [64, 65]. The shortage of studies in this stage of medication treatment may distort the reality of the incidence rate of errors.
Administration errors
Our review showed that administration errors occurred in 9.4 % to 80 % of drug administrations. This is higher than that reported in studies in HIC. Two observational studies found that medication administration error rates in the acute care setting varied between 14.9 % and 32.4 % in France and Switzerland, respectively [66, 67].
In our review only one observational study determined the frequency of MEs that occurred during the preparation and administration of intravenous drugs in an intensive care unit. It found that the rate of errors in drug administration (66.4 %) was higher than in preparation (33.6 %) [38]. Another study found that the medication administration error rate for intravenous medication is significantly higher than other types of medication, the researchers observing the preparation error rate as 26 % and the administration error rate as 34 % [68]. Our findings therefore are also consistent with the previous studies’ results highlighting that intravenous MEs occur more frequently than preparation errors [68]. In addition, Armitage and Knapman found that the frequency of administration errors ranges from 2.4 % to 47.5 %, depending on the drug distribution system in place [69]. The difference between the results of these studies may be affected by the different definitions and different methods used, and may also be due to the place of research and settings. However, in the UK a recent report by National Patient Safety Agency (NPSA) specified that 56 % of reported errors associated with severe harm occurred at the administration step [70].
Our results indicate that the most common types of errors reported were incorrect drug dose, wrong frequency and wrong strength during the prescribing stage. This is consistent with previous studies’ results. In comparison, studies of MEs in US and UK hospitals found that incorrect doses were the most common type of error [71]. The UK National Patient Safety Agency (2009) reported that the most common type of medication errors that occurred in the NHS was a wrong dose or wrong frequency of medications [6], also consistent with our findings.
Based on our review results, the main factor contributing to MEs in Middle Eastern countries is poor knowledge of medicines in both doctors (prescribers) and nurses (administering drugs), as was also the case with other studies’ [72]. Educational programmes for drug prescribers and nurses concerning drug therapy are urgently needed to avoid drug errors and to improve patient safety by clinical pharmacists and clinical pharmacologists. Different studies have found that clinical pharmacists play a significant role in delivering training and competency assessment [73].
Limitation of this review
Some limitations of this review should be considered in interpreting the results. The search strategy and search terms were designed in order to be as comprehensive as possible, but the databases used were directly biased to English-language research and studies. We therefore may have missed some studies because the original languages of the included countries of the Middle East is not English; all of the included countries speak Arabic except Iran (Persian) and Israel (Hebrew).
Conclusion
As the first systematic review to describe MEs in Middle Eastern countries, this review aimed to find out which scientific literature has reported on or evaluated MEs in Middle East countries. Although the studies related to MEs in the Middle Eastern countries were relatively few in number, there was a wide variation between studies in the error rates reported, and this may due to the variations in their definitions of medication errors, settings, the denominators and methodologies used. However, the quality of MEs studies that were identified in this review was poor. Most of the studies were conducted on adult patients, while very few MEs studies have been performed in paediatric hospitals. Many studies focused on prescribing errors and factors contributing to MEs. Our findings highlighted that poor knowledge of medicines was a contributory factor in both prescribers and nurses administering drugs. Middle Eastern countries urgently need to introduce educational programmes to improve prescribing skills and knowledge of prescribers, and to encourage nurses to improve their quality of drug administration.
Suggested recommendations
According to the review results, the following recommendations are suggested to allow decision-makers to improve medication safety and reduce MEs in Middle Eastern countries:
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Increase the awareness of MEs of health care professionals.
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Prescribers need to pay more attention to drug dosing.
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Improve medication error reporting systems and policy among the Middle Eastern countries by removing barriers, clarifying the importance of reporting and encouraging health care professionals to report medication errors.
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Clinical consequences of MEs should be assessed and evaluated in future studies
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Carry out regular intensive educational and training programmes in pharmacotherapy for undergraduate medical and paramedical students.
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Educational programmes by clinical pharmacists and clinical pharmacologists on drug therapy are urgently needed for doctors and nurses.
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Acknowledgments
Zayed Alsulami is a postgraduate research student and sponsored by the Saudi Arabian government. The authors acknowledge these sponsors. The authors also thank Vafadar-Isfahani Natasha and Peter J Vas for their help in translating four reviewed papers into the English language.
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The authors declare that they have no competing interests.
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All authors contributed to the manuscript during planning, data analysis, interpretation and revision. All authors approve of this final submitted version after their revision of the manuscript. Also, all authors agree to allow the corresponding author, Zayed Alsulami, to serve as the primary correspondent with the editorial office and to review and sign off on the final proofs prior to publication.
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Alsulami, Z., Conroy, S. & Choonara, I. Medication errors in the Middle East countries: A systematic review of the literature. Eur J Clin Pharmacol 69, 995–1008 (2013). https://doi.org/10.1007/s00228-012-1435-y
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DOI: https://doi.org/10.1007/s00228-012-1435-y