Journal of Cancer Survivorship

, Volume 12, Issue 3, pp 306–315 | Cite as

Consumer credit as a novel marker for economic burden and health after cancer in a diverse population of breast cancer survivors in the USA

  • Lorraine T. Dean
  • Kathryn H. Schmitz
  • Kevin D. Frick
  • Lauren H. Nicholas
  • Yuehan Zhang
  • S. V. Subramanian
  • Kala Visvanathan
Open Access



Consumer credit may reflect financial hardship that patients face due to cancer treatment, which in turn may impact ability to manage health after cancer; however, credit’s relationship to economic burden and health after cancer has not been evaluated.


From May to September 2015, 123 women with a history of breast cancer residing in Pennsylvania or New Jersey completed a cross-sectional survey of demographics, socioeconomic position, comorbidities, SF-12 self-rated health, economic burden since cancer diagnosis, psychosocial stress, and self-reported (poor to excellent) credit quality. Ordinal logistic regression evaluated credit’s contribution to economic burden and self-rated health.


Mean respondent age was 64 years. Mean year from diagnosis was 11.5. Forty percent of respondents were Black or Other and 60% were White. Twenty-four percent self-reported poor credit, and 76% reported good to excellent credit quality. In adjusted models, changing income, using savings, borrowing money, and being unable to purchase a health need since cancer were associated with poorer credit. Better credit was associated with 7.72 ([1.22, 14.20], p = 0.02) higher physical health t-score, and a − 2.00 ([− 3.92, − 0.09], p = 0.04) point change in psychosocial stress.


This exploratory analysis establishes the premise for consumer credit as a marker of economic burden and health for breast cancer survivors. Future work should validate these findings in larger samples and for other health conditions.

Implications for Cancer Survivors

Stabilizing and monitoring consumer credit may be a potential intervention point for mitigating economic burden after breast cancer.


Credit Economic burden Socioeconomic position Breast cancer Lymphedema Survivorship USA 


In the USA, one’s credit quality may dictate access to additional financial resources that can be leveraged to improve health. Consumer credit quality may be especially important to those with a history of cancer, given the extensive body of literature on high out-of-pocket costs leading to economic burden after cancer [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13]. Nearly half of cancer survivors experience financial distress [14] even among those who are insured [2, 3, 6, 7, 15]. Cancer survivors’ risk of bankruptcy is up to five times higher than those with no cancer history [15, 16]; among patients with a history of cancer, bankruptcy has been associated with a 79% greater risk of early mortality [17]. Out-of-pocket costs are even higher for those with adverse treatment effects due to cancer, such as breast cancer-related lymphedema [18, 19, 20, 21, 22, 23, 24, 25, 26], or comorbidities [2, 27]. Financial challenges due to cancer can delay the fulfillment of needs in other areas of life [4, 6, 28] and lead to greater physical and mental health challenges and lower quality of life [29, 30, 31, 32, 33]. Cancer survivors of low socioeconomic position (SEP) experience greatest economic burden due to cancer [2, 3, 27, 34, 35, 36, 37], but commonly used SEP measures (income, wealth, education, social status) [15] may not fully capture the additional resources to navigate economic challenges that are available to those with better credit quality; however, no studies have linked consumer credit to economic burden after cancer or assessed how credit might relate to physical and mental health outcomes for cancer survivors.

While there is a large body of literature on the relationship between debt and physical and mental physical health [38, 39], credit and debt are distinct. In the USA, credit scores are derived quantitative measures of a person’s financial history and cumulative series of financial decisions, based on the use and timely payment schedules of loans, credit cards, and debts for an individual [40, 41]. Credit quality is based on one’s financial history and cumulative series of financial decisions [40, 41] and better reflects debt/asset management than the amount of debt itself. For example, those with high debt may still have good credit quality if the payback schedule is consistently followed, while those with even low debt can have poor credit quality if the debt is not paid back consistently. Further, credit quality reflects actions taken to mitigate the impact of debt, including bankruptcy, which can affect credit ratings for up to 10 years, regardless of the actual amount of debt.

Only a few studies have linked credit to individual or population-based health conditions [40, 41, 42, 43, 44], and no studies have linked credit to health after cancer. One ecological study found small but significant increases in city-wide influenza severity among those who fell behind on debt payments, which would influence credit quality [43]. If an economic shock [43, 45] due to an acute disease like the flu is associated with consumer credit, the shock due to management of a chronic disease and adverse events arising from it could have larger and sustained impacts. To assess how an economic shock due to chronic disease might be associated with credit quality, this exploratory analysis assessed the relationships between current self-reported consumer credit quality and (a) economic burden since cancer, and (b) current mental and physical health in a sample of women who had experienced the chronic disease of breast cancer.

Materials and methods

Recruits were identified from prior participants of the Physical Activity and Lymphedema (PAL) trial (n = 295) [46, 47] or participants who were ineligible (n = 163) for the ongoing Women in Steady Exercise Research (WISER) Survivor Study ( #NCT01515124) [48] but met requirements for entry into PAL, who were still alive, had agreed to be contacted about future studies, and had updated contact information (Fig. 1). After these initial exclusions, 284 women were reached by phone in May to September of 2015 to be screened for eligibility in the PAL Social Economic and Quality of Life (PAL SEQL) follow-up study. Eligibility criteria included women with stage I–III invasive breast cancer after completion of active treatment, > 1 lymph node removed, and current resident of Pennsylvania or New Jersey. Those with active cancer or who were pregnant or planning to become pregnant in the next 6 months were excluded. Of the 284 reached, 26 declined prior to screening, leaving 258 who were screened for eligibility. Of those screened, 37 were ineligible, and 92 declined or dropped out due to not having time to participate in the study. Including those who declined before and after screening, the participation rate was 45%. Eligible non-participants were no different on any screening characteristic for which we could compare them to eligible participants. The study was approved by the Institutional Review Board of the University of Pennsylvania. Informed consent was obtained from all individual participants included in the study. After written consent, participants completed a baseline survey on credit, demographics, SEP, and health.
Fig. 1

Recruitment consort diagram


Demographics and current socioeconomic position

Participants self-reported current age, and US census-defined race. SEP measures included education, total annual household income before taxes in 2014, number of people supported by that income, total summed value of financial assets (sum of checking, savings, stocks, and bonds for participant and partner), and self-rating of MacArthur ladder social status scale reflecting where the respondent perceives she stands at this time in her life relative to other persons in the USA [49]. Because reporting finances is sensitive and subject to high non-reporting [50], income and cash assets were collected as category measures rather than exact numbers.

Adjuvant cancer treatments and health history

Participants self-reported completing chemotherapy and/or radiation therapy and/or hormone therapy after cancer surgery, and year of breast cancer diagnosis. Self-report of breast cancer treatment has been validated as over 90% accurate [51]. The total number of types of adjuvant treatments was included as covariate, rather than each as separate treatment variables, to prevent model overfitting due to a large number of covariates for this sample size. Over 98% of participants had insurance in the past year; thus, insurance status was not included as a covariate due to lack of variation. Participants self-reported any of 23 comorbidities and previous diagnosis of breast cancer-related lymphedema, an adverse effect of cancer treatment.

Perceptions of current credit quality were self-reported as the response to the question “How would you rate your consumer credit?: Poor, Fair, Good, Very Good, Excellent, and I don’t know/I don’t have any consumer credit, which was further combined into two categories of Poor/Fair and Good/Very good/Excellent. Six responses of I don’t know/I don’t have any consumer credit were dropped. A subset of participants (n = 73) later retrieved and reported a quantitative credit scores obtained within the last year from a US credit-reporting company or personal credit card, which was used as a numeric continuous variable. The majority of the scores (77.0%) were obtained from the, with the remainder from a credit bureau (21.7%) or personal credit card statement (1.4%).

Economic burden since cancer was assessed based on seven self-reported questions from the previously validated Breast Cancer Finances Survey [52, 53] on economic events occurring at any time since the cancer diagnosis: a change in income, and of those, a loss of income due to health; unemployment; increase in insurance premiums; using personal savings or retirement funds to cover health needs; borrowing money from others to cover a health need; or being unable to take care of health (“having an unmet health need”) due to limited finances.

Current health status

Physical and mental health status was assessed with composite and separate items from the 12-item Short Form Survey (SF-12) [54], with higher scores indicating better health.

Current psychosocial stress

The validated 10-item Perceived Stress Scale (PSS-10) assessed the degree to which a participant believed her life was uncontrollable or unpredictable in the past month [55]. Higher scores indicate more perceived stress.

Statistical analysis

Means and percentages of participant characteristics by credit quality were compared using χ2 tests or Fisher’s exact tests for variables with categories that had < 5 responses, and ANOVA. Associations between credit quality and dichotomous outcomes for economic burden since cancer diagnosis were evaluated using logistic regression. The economic burden scale items for loss of income and unemployment were dropped due to < 20 respondents endorsing them. Continuous outcomes of SF-12 health t-scores and perceived stress scores were evaluated using linear regression. All models adjusted for age based on previous literature suggesting better credit with age [41], and number of cancer treatment modalities, and years since cancer diagnosis. Lymphedema and comorbidities were included as confounders that are known to be a source of economic burden for those with a cancer history [2, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27]. Additionally, models adjusted for race and SEP variables, due to previous research suggesting that credit-scoring models penalize borrowers for using the types of credit that are disproportionately marketed to, and thus used by, racial/ethnic minorities [53], and those who live in economically disadvantaged communities [54]. All p values are two-sided.


Descriptive statistics in Table 1 are based on an analytic sample of the 123 participants who responded to the self-reported credit quality question of the total 129 participants enrolled in the study. Mean age was 64 years, and 40% of the sample was Black or some Other race, and 60% White. Approximately 24% had poor credit quality, and 76% reported good to excellent credit quality, which reflected subsequently higher objective credit scores. Among the 73 participants providing numeric scores, subjective credit quality and objective numeric score were highly correlated (0.81). Most participants had some college (76%), and annual household income greater than $70,000 (44%), supporting an average of two people including the participant. A little more than half had assets of < $50,000, and participants, on average, rated themselves as mid-level in social status. Mean time since cancer diagnosis was 11.5 years, and participants had an average of two cancer treatment modalities. Roughly half had lymphedema, and a little more than one third had two or more comorbidities. Over half reported experiencing a change in income since their cancer diagnosis (58%). Fewer than half experienced increases in insurance premiums (46%) or had to use their savings to cover expenses (38%), while less than one fifth borrowed money to pay for a health need (17%), or were unable to purchase a health need (19%) since their cancer diagnosis. Current composite physical health (46.3) was within the range of normative values for healthy females in the USA 45 to 75+ (ranges from 39 to 50), while composite mental health (50.5) was average (ranges 50–52) [56]. Mean perceived stress scores (19.8) were higher than population-based averages (16.1) for women of the same age range [57].
Table 1

Characteristics of study population (N = 123)


Mean (SD) or N (%)


Self-reported credit quality mean (SD) or N (%) [range]

p a

Poor/Fair n=30 (24.4%)

Good to Excellent n=93 (75.6%)



64 (8)



64 (8)





  Black and Other

49 (39.8%)

10 (33.3%)

39 (41.9%)



74 (60.2%)

20 (66.7%)

54 (58.1%)


Current consumer credit

Credit score, mean (n = 73)

742 (96)


577 (76)


778 (52)


< 0.001





 ≤ High school degree

29 (24.4%)

7 (25%)

22 (24.2%)


 Some college or more

90 (75.6%)

21 (75%)

69 (75.8%)


Household income (n = 118)


< 0.001

 ≤ $30,000

18 (15.3%)

11 (37.9%)

7 (7.9%)



48 (40.7%)

14 (48.3%)

34 (38.2%)


 > $70,000

52 (44.1%)

4 (13.8%)

48 (53.9%)


Number supported by income

2 (1)


2 (1)


2 (1)



Total cash assets (n = 113)


< 0.001

 ≤ 49,999

60 (53.1%)

25 (83.3%)

35 (42.2%)


 ≥ $50,000

53 (46.9%)

5 (16.7%)

48 (57.8%)


Social status

6.2 (1.8)


4.5 (1.6)


6.8 (1.6)


< 0.001


Years since diagnosis (n = 122)

11.5 (4.5)


12 (4.2)


11 (4.6)



Number of adjuvant cancer treatment modalities (n = 120)

2 (1)


2 (1)


2 (1)





66 (53.7%)

12 (40.0%)

54 (58.1%)



57 (46.3%)

18 (60.0%)

39 (41.9%)


Comorbid conditions



 0 or 1

79 (64.2%)

16 (20.3%)

63 (67.7%)



44 (35.8%)

14 (31.8%)

30 (32.3%)



Change in income (n = 118)

68 (57.6%)

22 (75.9%)

46 (51.7%)


Insurance premiums increased (n = 121)

56 (46.3%)

17 (58.6%)

39 (42.4%)


Used savings (n = 122)

46 (37.7%)

21 (72.4%)

25 (26.9%)

< 0.001

Borrowed money (n = 121)

21 (17.4%)

13 (44.8%)

8 (8.8%)

< 0.001

Unable to purchase health need (n = 119)

23 (19.3%)

15 (53.6%)

8 (8.8%)

< 0.001


SF-12 health (t-scores)

Composite physical health

46.2 (11.6)


35.8 (13.1)


48.9 (9.8)


< 0.001

 General health

43.7 (10.5)


36.2 (7.9)


45. 8 (10.3)


< 0.001

 Physical functioning

46.6 (13.5)


37.3 (17.0)


49.4 (11.2)


< 0.001

 Role limitations—physicalb

47.1 (8.3)


42.3 (8.8)


41.5 (8.4)


< 0.001

 Bodily pain

50.0 (11.8)


44.3 (14.4)


52.2 (9.7)



Composite mental health

50.5 (9.1)


47.1 (8.3)


51.3 (9.1)




48.2 (11.2)


41.6 (11.8)


50.0 (10.3)



 Social functioning

48.7 (10.9)


41.6 (11.3)


51.2 (9.5)


< 0.001

 Role limitations—emotionalb

50.5 (7.0)


46.3 (8.5)


51.8 (5.8)



 Mental health

48.4 (10.6)


42.9 (9.5)


49.8 (10.4)



Perceived stress (PSS-10)c

19.8 (3.4)


21.3 (3.8)


19.3 (3.0)



aAssociations between credit quality and key covariates were evaluated using contingency tables. All P-values are two-sided

bHigher SF-12 scores correspond to more favorable health outcomes

cHigher PSS-10 scores correspond to higher stress

Participants with higher household income, more people supported by that income, more cash assets, and higher social status had significantly better credit quality than those of lower SEP (p < 0.01). There was no difference in self-reported credit quality based on number of years since cancer diagnosis, cancer treatment modalities, presence of breast cancer-related lymphedema, or comorbidities. Those with better credit quality were significantly less likely to have had a change in income (p = 0.02), used savings, borrowed money, or had been unable to purchase a health need since cancer (p < 0.001). Correlations among economic burden events ranged from − 0.18 to 0.52. Means for all SF-12 t-scores were significantly higher for participants with better credit quality (p < 0.05), while lower stress scores were found in better self-reported credit categories (p = 0.004).

Tables 2 and 3 present results on the relationship between self-reported credit quality and economically burdensome events (Table 2) and health outcomes (Table 3). After adjusting for race, age, SEP, cancer treatments, years since diagnosis, lymphedema, and comorbid conditions, log odds of having a change in income (− 1.52 [− 2.93, − 0.11], p = 0.03), using savings (− 1.42 [− 2.73, − 0.11], p = 0.03), borrowing money (− 2.51 [− 4.20, − 0.82], p = 0.004), and being unable to purchase a health need (− 2.07 [− 3.62, − 0.52], p = 0.009), all since cancer, were associated with poorer consumer credit. SF-12 composite physical health t-score (7.72 [1.22, 14.20], p = 0.02) was the most strongly associated with credit quality, followed by vitality (7.80 [1.76, 13.85], p = 0.01), general health (7.03 [1.55, 12.50], p = 0.01), and social functioning (6.62 [1.11, 12.12], p = 0.02). Better credit was significantly associated with a lower perceived stress score (− 2.00 [− 3.92, − 0.09], p = 0.04).
Table 2

Log odds (logit regressions) of credit quality and economic burden since breast cancer


Self-reported credit qualitya

β (SE)

95% CI


Change in income since cancer

− 1.52 (0.72)

− 2.93, − 0.11


Insurance premiums increased since cancer

− 0.66 (0.64)

− 1.92, 0.39


Used savings since cancer

− 1.42 (0.67)

− 2.73, − 0.11


Borrowed money since cancer

− 2.51 (0.86)

− 4.20, − 0.82


Unable to purchase health need since cancer

− 2.07 (0.79)

− 3.62, − 0.52


Table 3

Linear coefficients of credit quality and health after breast cancer


Outcome: self-reported credit qualitya

β (SE)

95% CI


Composite physical health

7.72 (3.26)

1.22, 14.20


 General health

7.03 (2.75)

1.55, 12.50


 Physical function

3.48 (3.77)

− 4.01, 10.97


 Role limitations due to physical functionb

4.63 (2.38)

− 0.10, 9.36


 Bodily pain

4.83 (3.25)

− 1.63, 11.30


Composite mental health

2.96 (2.85)

− 2.71, 8.63



7.80 (3.01)

1.76, 13.85


 Social functioning

6.62 (2.77)

1.11, 12.12


 Mental health

5.13 (3.09)

− 1.02, 11.27


 Role limitations due to emotional function b

2.39 (1.98)

− 1.54, 6.32


Perceived stress (PSS-10) b

− 2.00 (0.96)

− 3.92, − 0.09


aAdjusted for age, race, SEP (education, income, number being supported by that income, assets, social status), number of cancer treatments, years since diagnosis, presence of lymphedema, and comorbid conditions

bHigher SF-12 t-scores correspond to more favorable health outcomes. Higher PSS-10 scores correspond to higher stress


Building upon previous studies linking self-reported credit quality to health [40, 41, 42, 43, 44], this exploratory study assessed whether or not self-reported consumer credit, net of socioeconomic factors, and comorbid conditions were associated with economic burden and mental and physical health after cancer, among a sample of long-term breast cancer survivors. Results showed that some domains of economic burden after cancer including having a change in income, using savings, borrowing money, and being unable to purchase a health need were each associated with poorer self-reported credit. Overall physical and general health, mental health subdomains of vitality and social functioning, and less psychosocial stress were associated with better self-reported credit.

Consumer credit quality may reflect access to additional forms of capital, like savings accounts or financial help from other sources that can be leveraged to buffer economic burden after chronic disease. This is especially important for cancer survivors, who are more likely than those with no cancer history to experience job changes, have fewer financial resources, or experience increased insurance costs [58, 59, 60]. The results of this exploratory analysis provided partial support of this pathway; however, the study was not powered to assess the impact of income loss or unemployment specifically. Additionally, results suggest that using savings, borrowing money, and being unable to purchase a health need might be financial distress signals that are reflected in consumer credit ratings. Those who use up their personal savings may leverage credit to take out personal loans to cover medical care or medical debt. Having greater debt itself may lead to poorer credit quality, but credit in any amount that is not well managed or results in defaults could lead to detrimental hits to credit quality. The need to leverage credit itself may be a sign of financial distress that reflects underlying unmet needs after cancer, which has been associated with lower mental quality of life [29, 61] and greater emotional distress among cancer survivors [30].

Better self-reported consumer credit quality was associated with better physical health, vitality, better social functioning, and less stress, which may suggest that having good credit opens access to resources to buffer how much poor physical health interferes with day-to-day activities and social affairs. For example, the need for vitality to manage affairs may be especially important for those with a history of cancer, who may suffer from cancer-related fatigue that limits their ability to handle daily affairs [62], like managing credit, and conducting social affairs. The present results provide partial support of a relationship between credit and mental health outcomes of vitality and social functioning. Worse consumer credit may be associated with psychosocial stress by reflecting the context of economic hardship that increases allostatic load [63]; however, a relationship with allostatic load would need to be explored empirically in other studies.

While promising, using consumer credit in health studies faces challenges of validity and generalizability, which have contributed to this study’s limitations. Self-reported credit is not a validated measure but in this sample was highly correlated (r = 0.81) with the objective quantitative scores suggesting that self-reported credit quality may be a strong substitute for credit score. Cognitive interviewing for this item may have improved its validity. Credit scores retrieved from different sources may not be equivalent in what they represent or be calculated from equivalent information: a score of 700 may be good by one model’s standards, but fair by another. Thus, self-reported credit quality may be a better measure than numeric scores for assessing self-reported health outcomes, because it captures the perceived influence that consumer credit has on everyday life.

As a cross-sectional study with a one-time measure of credit, the direction of association between credit and health could not be assessed. Thus, it is possible that those who have managed poor health for many years were less likely to maintain income and earnings, which led to poor credit. Longitudinal analysis of credit and health outcomes could illuminate this pathway, and this exploratory study establishes the premise of an association that should be further explored. Given a 45% study participation rate, the results may not reflect what would have been found in a sample that had a larger proportion of eligible participants joining the study; yet, 45% is a participation rate that is in line with well-respected population-based surveys such as the Behavioral Risk Factor Surveillance Survey (BRFSS) [64]. The results may not be generalizable beyond this sample of women with a history of breast cancer or beyond the US context for consumer credit; however, this exploratory analysis sets a precedent for these associations to be explored in broader samples.


In conclusion, consumer credit quality may reflect both economically burdensome events and health outcomes after cancer and could be a useful inclusion in screening for financial distress [65]. While future studies will be necessary to elucidate the extent to which consumer credit can predict health outcomes in the broader population, this exploratory analysis sets a foundation for pathways to explore. Future work should explore associations between credit and additional cancer-related health outcomes across broader populations and geographies and use longitudinal data to assess the causal pathways that might link credit and health.

Implications for cancer survivors

Altogether, results of this exploratory study suggest that consumer credit shows promise as a unique contribution to understanding the long-term financial impact of breast cancer, which may have implications for health after cancer. If these results are validated in larger studies, implications for cancer survivors include encouraging policies to stabilize consumer credit that arises due to medical debt, or monitoring changes in consumer credit for cancer survivors to determine when intervention is necessary to prevent bankruptcy or long-term economic strain.



The authors thank Drs. Jay Kaufman, Kevin Volpp, and Catherine Cubbin for contributions to ideas in this manuscript.


This work was supported by the National Center for Research Resources and the National Center for Advancing Translational Sciences (NCATS) of the National Institutes of Health through grant number 1UL1TR001079 (statistical consultation); the National Institute of Mental Health R25MH083620; the National Cancer Institute grant K01CA184288 (Lorraine T. Dean); the Sidney Kimmel Cancer Center grant P30CA006973 (Lorraine T. Dean, Kala Visvanathan, Yuehan Zhang); Johns Hopkins University Center for AIDS Research grant P30AI094189 (Lorraine T. Dean); National Institute on Aging grant K01AG04176 (Lauren Nicholas); National Cancer Institute grants R01CA106851 and 1U54CA155850-01 (Kathryn H. Schmitz).

Compliance with ethical standards

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The study was approved by the Institutional Review Board of the University of Pennsylvania. Informed consent was obtained from all individual participants included in the study, prior to any data collection.

Conflict of interest

The authors declare that they have no conflicts of interest.


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© The Author(s) 2017

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  • Lorraine T. Dean
    • 1
    • 2
    • 3
  • Kathryn H. Schmitz
    • 4
  • Kevin D. Frick
    • 2
    • 5
  • Lauren H. Nicholas
    • 2
  • Yuehan Zhang
    • 6
  • S. V. Subramanian
    • 7
  • Kala Visvanathan
    • 1
    • 3
  1. 1.Department of Epidemiology, Johns Hopkins Bloomberg School of Public HealthJohns Hopkins UniversityBaltimoreUSA
  2. 2.Department of Health Policy and Management, Johns Hopkins Bloomberg School of Public HealthJohns Hopkins UniversityBaltimoreUSA
  3. 3.Department of OncologyJohns Hopkins School of MedicineBaltimoreUSA
  4. 4.Department of Public Health Sciences, Pennsylvania State University College of MedicinePennsylvania State UniversityHersheyUSA
  5. 5.Johns Hopkins Carey Business SchoolJohns Hopkins UniversityBaltimoreUSA
  6. 6.Department of General Internal Medicine, University of Pennsylvania School of MedicineUniversity of PennsylvaniaPhiladelphiaUSA
  7. 7.Department of Social and Behavioral Sciences, Harvard T.H. Chan School of Public HealthHarvard UniversityBostonUSA

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