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. Author manuscript; available in PMC: 2018 Jun 1.
Published in final edited form as: J Shoulder Elbow Surg. 2017 Feb 2;26(6):1103–1112. doi: 10.1016/j.jse.2016.11.038

Genetic and Familial Predisposition to Rotator Cuff Disease: A Systematic Review

Dominique I Dabija 1, Chan Gao 2, Todd L Edwards 3, John E Kuhn 4, Nitin B Jain 2,3,4
PMCID: PMC5438768  NIHMSID: NIHMS849812  PMID: 28162885

Abstract

Background

Rotator cuff disease is a common disorder leading to shoulder pain and loss of function. Its etiology in atraumatic cases is uncertain and likely extends beyond repetitive micro-trauma or overuse. Our objective was to determine whether there is a genetic or familial predisposition to rotator cuff disease.

Methods

A literature search of PubMed and EMBASE databases identified 251 citations. After reviewing the titles, abstracts, and full articles, seven met our inclusion/exclusion criteria.

Results

Four studies assessed familial predisposition to rotator cuff disease. One of these demonstrated that siblings of an individual with a rotator cuff tear were more likely to develop a full-thickness tear and more likely to be symptomatic. A five-year follow-up showed that the relative risks were increased for the siblings to have a full-thickness tear, for a tear to progress in size, and for being symptomatic. Another study demonstrated that a significantly higher number of individuals with tears had family members with a history of tears or surgery than those without tears. The other three studies investigated whether a genetic predisposition to rotator cuff disease exists and found significant association of haplotypes in DEFB1, FGFR1, FGFR3, ESRRB, and FGF10, and two single nucleotide polymorphisms within SAP30BP and SASH1.

Conclusion

Prior studies provide preliminary evidence for genetic and familial predisposition to rotator cuff disease. However, there is a lack of large genome-wide studies that can provide more definitive information and guide early detection of individuals at risk, prophylactic rehabilitation, and potential gene therapies and regenerative medicine interventions.

Level of Evidence

Systematic Review

Keywords: Rotator cuff disease, rotator cuff tears, tendinopathy, genetic predisposition, familial predisposition, epidemiology


Tendon disorders account for over 30% of all musculoskeletal office visits1. Rotator cuff disease is a common disorder and affects 30–50% of the population older than 50 years of age17. It includes a spectrum of pathology ranging from tendinopathy to partial or complete tears19. Rotator cuff disease is associated with shoulder pain and loss of function28. There were an estimated 272,148 ambulatory surgeries performed for rotator cuff tears in the United States in 20069.

The cause of atraumatic rotator cuff tears has only been studied by a limited number of investigators and remains unknown. The pathophysiology of rotator cuff tearing is described as intrinsic defects of tendons, including increased tendon cell death, a higher proportion of fat composition, aberrant microstructure of structural fibers, and abnormal nutrient vessels4, 14. This suggests that atraumatic rotator cuff tears are not purely due to repetitive micro-trauma or overuse. It is possible that the biological changes are regulated by genes. Identifying genes associated with rotator cuff disease and rotator cuff tears can help early recognition of individuals at higher risk of developing this pathology. This could warrant application of primary or secondary prevention strategies for this specific population.

The purpose of this study was to perform a systematic review on the genetic and familial predisposition to rotator cuff disease.

Materials and Methods

The term rotator cuff disease is used loosely in the literature. This term can encompass disorders ranging from impingement to tendinopathy to rotator cuff tearing. The transition from rotator cuff tendinopathy to rotator cuff tear was described as a continuum by Neer19. Hence, in our study we used the umbrella term rotator cuff disease and included studies on impingement syndrome and rotator cuff tendinopathy/tear.

A systematic literature search on familial or genetic predisposition to rotator cuff disease of PubMed and EMBASE databases was performed from their years of inception through March 2016. The database search was performed with the help of a trained librarian, and the keywords used included “rotator cuff disease,” “genetics,” “polymorphism,” and “family.” The full search criteria can be found in the appendix (Appendix A). Initially, 251 citations were identified, and two of the authors (C.G. and N.B.J.) independently reviewed the titles and abstracts for relevance. The full texts of 17 of the citations were then reviewed, and 10 studies were found not to be relevant to our topic. Bibliographies of full text articles that met our inclusion criteria were also reviewed for additional articles. No additional articles were gained from the bibliography search.

The studies included in this review were assessed with the Methodological Index for Non-Randomized Studies (MINORS) and were scored accordingly25. The maximum possible score was 24. When required, authors of included articles were contacted for additional information. We used the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) methodology for reporting our manuscript13.

Results

The initial literature search produced 251 articles which were assessed for relevance by their title and abstract. Of these, 234 were excluded due to lack of relevance to our topic. After the remaining 17 full texts were reviewed, seven studies were found to meet the inclusion criteria and were thus included in our final analysis (Figure 1).

Figure 1.

Figure 1

PRISMA diagram of the literature search and study selection

*Inclusion criteria: studies on familial predisposition or genetic epidemiology of rotator cuff disease

Four studies investigated whether there is a familial predisposition to rotator cuff disease. One of these studies (n = 129) demonstrated that siblings of an individual with a rotator cuff tear were twice as likely to develop a full-thickness tear and nearly five times more likely to suffer symptoms, when compared to spouses of these individuals (Table I)7. A five-year follow-up (n = 62) showed that the relative risk for the siblings to have a full-thickness tear was 2.85 (95% CI 1.75–4.64) compared to the control population, the relative risk for a tear to progress in size was 2.08 (95% CI 1.58–2.7), and the relative risk of having a symptomatic tear was 1.44 (95% CI 2.04–8.28) (Table I)6. Tashjian et al’s 2009 study (n = 3,091) used the Genealogical Index of Familiality to demonstrate a significant excess relatedness when all generations were used but not when only looking at more distant relationships (Table I)29. When only individuals diagnosed before age 40 (n = 652) were studied, significant excess relatedness was found when both all generations and only more distant relationships were used (Table I). Close relationships were defined as those between first- and second-degree relatives, while distant relationships were those with a genetic path length of at least three. Excess relatedness was used interchangeably with excess familial clustering or heritable predisposition. Tashjian et al’s 2014 study (n = 92) demonstrated that a significantly higher number of individuals with rotator cuff tears (32.3%) also had family members with a history of rotator cuff tears or surgery when compared to individuals without rotator cuff tears (18.3%) (Table I)31.

Table I.

Studies on familial predisposition to rotator cuff disease

Study Methods Participants Group Definitions Results Source of Funding Notes
Harvie et al.6 (2004) Case-control Cases: n = 129; mean age 63.1 (41 to 85)
Controls: n = 150; mean age 62.4 (43 to 85)
Case: Included siblings of individuals diagnosed with a rotator cuff tear by ultrasound. Excluded those who were not available for review, were not full first-degree relatives of individuals with rotator cuff tears, or had concomitant systemic disease affecting the function of the shoulder.
Control: Included spouses of individuals diagnosed with a rotator cuff tear by ultrasound.
Relative to Controls, Cases participants had more than twice the risk of developing full-thickness tears (p < 0.0001), and nearly five times the risk of suffering symptoms (p < 0.0001).
No significant differences were found in other measures between Cases and Controls.
Girdlestone Memorial Scholarship in Orthopaedic Surgery from The Lord Nuffield Orthopaedic Centre Trust
Gwilym et al.5 (2009) Case-control Cases: n = 62; mean age 66.6 (46 to 88)
Controls: n = 68; mean age 66.1 (52 to 82)
Case: Included siblings of individuals diagnosed with a rotator cuff tear by ultrasound. Excluded individuals who had shoulder surgery or had a systemic disease affecting shoulder function.
Control: Included spouses of individuals diagnosed with a rotator cuff tear by ultrasound. Excluded individuals who had shoulder surgery or had a systemic disease affecting shoulder function.
69.2% of Cases had full-thickness tears compared to 22.1% of Controls (p = 0.0001).
The relative risk estimate for Cases to have a full-thickness tear was 2.85 (95% CI 1.75–4.64, p = 0.0001).
The relative risk progression in Cases compared to Controls was 2.08 (95% CI 1.58–2.7) (p = 0.007).
The relative risk of pain associated with a full-thickness tear in Cases compared to Controls was 1.44 (95% CI 2.04–8.28)
None stated. 5-year follow-up to Harvie et al.6 (2004) with a loss of follow up of about half the original cohort
Tashjian et al.24 (2009) Population-based case-control Cases: n = 3,091
Case Subgroup: n = 652
Controls: n = 15,455
Case: Included individuals who went to the University of Utah Hospital and Clinics, had an ICD-9 diagnosis code or CPT-4 procedure code, and had at least three generations of genealogical data.
Case Subgroup: Included individuals in Case group who were diagnosed before age 40.
Control: Included individuals who were in the Utah Population Database and had genealogical data.
The overall Genealogical Index of Familiality shows a significant excess relatedness for Cases (p < 0.001), but the distance tests shows that excess relatedness observed is not significant when close relationships are ignored (p = 0.848). First degree relatives of Cases had p < 0.0001, relative risk of 2.44, and 95% CI 2.06–2.89. Second degree relatives had p = 0.0177, relative risk of 1.24, and 95% CI 1.04–1.48. Third degree relatives had p = 0.2866, relative risk of 1.08, and 95% CI 0.94–1.24.
For Case Subgroup participants, both the overall (p = 0.001) and distance Genealogical Index of Familiality (p = 0.004) tests show significant excess relatedness. First degree relatives of Case Subgroup participants had p = 0.2614, relative risk of 1.73, and 95% CI 0.69–4.37. Second degree relatives had p = 0.0076, relative risk of 3.66, and 95% CI 1.47–9.11. Third degree relatives had p = 0.0479, relative risk of 1.81, and 95% CI 1.05–3.11.
National Institutes of Health-National Library of Medicine
University of Utah Huntsman Cancer Institute
Tashjian et al.26 (2014) Case-control Cases: n = 92; mean age 58.24 +/− 7.4
Controls: n = 92; mean age 58.42 +/− 8.5
Case: Included individuals who had magnetic resonance imaging (MRI)-confirmed, symptomatic, full-thickness rotator cuff tears.
Control: Included individuals who were over age 18 and had no shoulder pain or prior shoulder injury or surgery.
32.3% of Cases reported having family members with a history of rotator cuff tears or surgery, compared with 18.3% of Controls (p = 0.035).
22.8% of Cases reported having family members with tendon problems or surgery, compared with 17.5% of Controls (p = 0.407).
38.7% of Cases reported having a history of other tendon problems, compared with 19.3% of Controls (p = 0.005).
18.3% of Cases reported having other prior tendon surgeries, compared with 13.6% of Controls (p = 0.605).
None stated. Control matching between group participants was based on age to within five years

Three studies investigated the genes associated with rotator cuff disease by using association analyses to map genes to rotator cuff disease. One of these studies (n = 203) found a significant association of certain haplotypes in DEFB1, FGFR1, FGFR3, and ESRRB with rotator cuff disease (Table II)17. After adjusting for ethnic group and sex, another association was found for FGF10 (Table II). A second study (n = 175) discovered two haplotypes in ESRRB that significantly increased the risk of tears (Table II)32. The third study (n = 311) found two single nucleotide polymorphisms (SNPs) within genes SAP30BP and SASH1 associated with rotator cuff tears (Table II)30. The specific SNPs and haplotypes associated with rotator cuff disease from these three prior studies are presented in Table III. The accompanying forest plots are in Figures 2 and 3.

Table II.

Studies on genetic predisposition to rotator cuff disease

Study Methods Participants Group Definitions Results Source of Funding Notes
Motta et al.13 (2014) Case-control Cases: n = 203; mean age 51.8 +/− 5.1
Controls: n = 207; mean age 53.5 +/− 5
Case: Included individuals diagnosed with rotator cuff disease by clinical examination, radiography, and MRI. Excluded individuals who were older than 60 or younger than 45; or had a history of trauma, bursitis, rheumatoid arthritis, autoimmune diseases, pregnancy, chronic systemic corticoid use, or hyperlaxity.
Control: Included individuals who had no history of shoulder pain, a negative specific test result for impingement syndrome, and absence of tendinopathy in other joints.
Whites (p = 0.002) and women (p = 0.001) had a higher prevalence of rotator cuff disease. Based on odds ratio calculation, the risk in women (OR 2.07, 95% CI 1.30–3.30) and whites (OR 1.88, 95% CI 1.21–2.90) was two times higher than in group 2. Cases had a higher incidence of high blood pressure (p < 0.001). Controls had a higher prevalence of systemic diseases (p < 0.0001), medication use (p = 0.01), and calcium supplementation (p = 0.01).
A significant association of certain haplotypes in DEFB1, FGFR1, FGFR3, and ESRRB was observed with RCD. Adjusted by ethnic group and sex revealed another association in FGF10
None stated.
Teerlink et al.27 (2015) Case-control Cases: n = 175
Controls: n = 2,595
Case: Included individuals who had a full-thickness supraspinatus or infraspinatus rotator cuff tear documented on MRI after age 30 and before age 80. Excluded individuals who had a partial-thickness rotator cuff tear, tendinopathy only, or significant glenohumeral arthritis; or had prior surgery on the involved shoulder. There was a significant association between ESRRB genetic variants and rotator cuff disease. Two haplotypes constructed from 22 SNPs spanning ESRRB both significantly increased the risk of rotator cuff tearing Veterans Administration Merit Review Grant (Number 1157449) U.S. Department of Veterans Affairs
Tashjian et al.25 (2016) GWAS Cases: n = 311
Controls: n = 2,641
Case: Included individuals who had a full-thickness supraspinatus or infraspinatus rotator cuff tear documented on MRI, and who were older than 30 and younger than 80. Excluded individuals who had a partial-thickness rotator cuff tear, tendinopathy only, or significant glenohumeral arthritis; or had prior surgery on the involved shoulder. Two SNPs within genes SAP30BP (rs820218) and SASH1 (rs12527089) were significantly associated with rotator cuff tears Veterans Administration Merit Review Grant (No. 1157449), U.S. Department of Veterans Affairs Teerlink et al.27 (2015) found an associated SNP in ESRRB, which was further confirmed in this study

Table III.

Associations between rotator cuff disease and specific SNPs

Study Gene SNP Chromosome Base Pair Position P value Odds Ratio (95% CI) Haplotypes P value Odds Ratio (95% CI)
Motta et al.13 (2014) DEFB1 rs1800972 8 6735423 3.4x10−40 1.98 (1.79–2.18) DEFB1 CC 3.7x10−2 1.58 (1.03–2.43)

ESRRB rs4903399 14 76775202 4.9x10−2 0.64 (0.41–0.98) ESRRB CCTTCCAG 5.4x10−2 0.30 (0.09–1.02)

rs1676303 14 76992164 6.4x10−3 0.23 (0.08–0.62)

FGF3 rs12574452 11 69631731 2.7x10−2 0.31 (0.11–0.84) FGF3 CGACG 1.3x10−2 0.52 (0.31–0.86)

FGFR1 rs13317 8 38269514 5.3x10−2 2.67 (1.02–7.21)

FGF10 rs1011814 5 44335820 4.6x10−1 1.20 (0.75–1.94)

rs900379 5 44369656 9.9x10−2 0.68 (0.43–1.07)

rs11750845 5 44373060 9.6x10−2 0.70 (0.46–1.05)



Teerlink et al.27 (2015) ESRRB rs17583842 14 76050858 4.9x10−3 1.41 (1.11–1.79) Haplotype 1 3.4x10−9 5.7 (3.2–10.1)

rs7157192 14 75936713 NA NA Haplotype 2 5.9x10−8 5.3 (2.9–9.5)



Tashjian et al.25 (2016) SAP30BP rs820218 17 73687545 4.3x10−10 0.4 (0.3–0.5)

SASH1 rs12527089 6 148787159 8.4x10−7 2.4 (1.7–3.4)

ESRRB NA NA NA 1.9x10−2 NA

SNP = Single Nucleotide Polymorphism

NA = not available

Figure 2.

Figure 2

Forest plot depicting the odds ratios and confidence intervals of specific SNPs

Figure 3.

Figure 3

Forest plot depicting the odds ratios and confidence intervals of specific haplotypes

The results of bias assessment according to the MINORS criteria are in Table IV25. All of the studies had a clearly stated aim, prospective collection of data, end points appropriate to the aim of the study, loss to follow-up <5%, and contemporary groups. Six studies included consecutive patients6, 7, 17, 29, 30, 32, two stated they had unbiased assessments of study end points6, 7, one had a prospective calculation of the study size17, three had adequate control groups6, 7, 29, five had baseline equivalence of groups6, 7, 17, 29, 31, and five had adequate statistical analyses7, 17, 29, 30, 32. The lowest score was 1631, and the highest was 227.

Table IV.

MINORS scores

Criteria Score

Harvie et al.6 (2004) Gwilym et al.5 (2009) Tashjian et al.24 (2009) Tashjian et al.26 (2014) Motta et al.13 (2014) Teerlink et al.27 (2015) Tashjian et al.25 (2016)
A clearly stated aim 2 2 2 2 2 2 2
Inclusion of consecutive patients 2 2 2 0 2 2 2
Prospective collection of data 2 2 2 2 2 2 2
End points appropriate to the aim of study 2 2 2 2 2 2 2
Unbiased assessment of the study end point 2 2 0 0 0 0 0
Follow-up period appropriate to the aim of study 2 2 2 2 2 2 2
Loss to follow-up <5% 2 2 2 2 2 2 2
Prospective calculation of the study size 0 0 0 0 2 0 0
Adequate control group 2 2 2 1 2 1 1
Contemporary group 2 2 2 2 2 2 2
Baseline equivalence of groups 2 2 2 2 2 1 1
Adequate statistical analysis 2 1 2 1 2 2 2

Total 22 21 20 16 22 18 18

MINORS = Methodological Index for Non-Randomized Studies

Discussion

Rotator cuff disease is a common tendon disorder that is associated with shoulder pain and functional disability. The pathogenesis of rotator cuff disease is not completely understood. Identifying a possible genetic association could help our understanding of the disease process that leads to rotator cuff pathology. This systematic review summarized studies on familial and genetic predisposition to rotator cuff disease. Although there were only a limited number of studies on this topic, they do in general constitute a consensus that rotator cuff disease is a heritable trait.

Rotator cuff disease is a generic term that can be used to describe impingement syndrome, subacromial/subdeltoid bursal pathology, rotator cuff tendinopathy, and rotator cuff tear. An issue with prior literature is the absence of a uniform definition and diagnostic criteria for rotator cuff disease. Even in studies limited to rotator cuff tears, the case definition is variable. One study used clinical diagnosis29 by a physician as their criterion, whereas other studies used ultrasound6, 7 and MRI17, 3032 for diagnosis. One of the studies used a criterion of whether the patient underwent a surgical rotator cuff repair29. Rotator cuff pathology is a clinical syndrome since structural defects found on imaging have been demonstrated in asymptomatic individuals.16, 24 Hence the case definition of rotator cuff pathology needs to account for both clinical presentation and structural deficit.

Harvie et al compared the rates of symptomatic and asymptomatic tears in siblings and spouses of individuals with rotator cuff tears, and determined that both were higher in siblings7. A follow-up study demonstrated that rotator cuff tears in siblings also had a higher risk of progressing6. Another study reported differing results when analyzing all of their subjects versus analyzing only those diagnosed before the age of 4029. The entire cohort did not demonstrate excess relatedness when only distant relationships were studied, implying that perhaps environmental factors were playing a confounding role. In contrast, the subgroup of younger patients showed excess relatedness in both close and distant relationships.

The genetic association studies observed associations between rotator cuff disease and SNPs in seven candidate genes (Table III, Figure 2, Figure 3)17, 30, 32. DEFB1 (Defensin, Beta 1) encodes the protein antimicrobial peptide defensin β-1, which aids in preventing epithelial surfaces from being colonized by microbes. The rs1800972 C>G variant was significantly more frequent in individuals with rotator cuff disease17. This base change is thought to lead to a decreased production of defensin β-1 production and higher expression levels.20, 21 The G allele is also more common in individuals with severe acute pancreatitis and less predominant in individuals with diabetes and S. aureus nasal colonization8, 20, 21.

ESRRB (estrogen-related receptor beta) encodes a protein similar to the estrogen receptor and is believed to have an inhibitory effect on estrogen signaling27. Mutations in this gene have also been associated with hearing impairment and dental decay35. In addition, upregulation of ESRRB has been linked with the progression of endometriosis3. In vitro studies have demonstrated a correlation between estrogen deficiency and poor tendon healing34, implying a possible role ESRRB may have in rotator cuff disease.

FGF3 (fibroblast growth factor 3) and FGF10 (fibroblast growth factor 10) encode fibroblast growth factor proteins and are involved in a number of processes such as cell growth and tissue repair, including tendons, and could thus be associated with the pathogenesis of rotator cuff disease. Mutations in FGF3 have been linked with improper embryonic development of the inner ear33. Mutations in FGF10 can lead to aplasia of lacrimal and salivary glands5. FGFR1 encodes one of the receptors also associated with fibroblast growth factor; however, this gene is more specific to limb development. Mutations have been associated with cleft lip and cleft palate, Pfeiffer syndrome, and osteoglophonic dysplasia18, 22, 36.

SAP30BP is implicated in cell death. SASH1 is a tumor suppressor gene implicated in a number of cancers23, 37. Thus, many of the SNPs associated with rotator cuff disease have a potential biologic mechanism for their association with rotator cuff disease, but further research is needed in this area.

A few studies on familial and genetic predisposition to rotator cuff disease have used controls from the general population, and have used cases and controls genotyped on different platforms in different experiments3032. This is problematic since these studies assume that the prevalence of rotator cuff disease in the general population is low. This can also cause bias if the cases and the controls vary in other characteristics related to risk of rotator cuff disease, or if there are systematic differences in genotyping error between platforms. However, asymptomatic rotator cuff tears are demonstrated in 40% of persons over the age of 50 years, 54% in those over 60 years, and 65% in persons over 7016, 24. Many of these patients will progress to a symptomatic rotator cuff tear in the future15. Hence, true controls are individuals from the general population that are asymptomatic and do not have structural evidence for a rotator cuff tear.

The findings of previous studies provide evidence that there may be an important relationship between genes and rotator cuff disease. However, data on this issue is still limited. To our knowledge, only one study performed a genome wide association analysis (GWAS), which found two SNPs within genes SAP30BP and SASH1 associated with rotator cuff tears30. Both gene products, SAM and SH3 domain-containing protein 1 (SASH1) and SAP30-binding protein (SAP30BP), were reported in the process of cell apoptosis30. The effort to identify susceptibility genes of common multifactorial traits could lead to some insight into the pathogenesis mechanism that would, in turn, facilitate the development of better therapeutic and prophylactic approaches. However, many significant GWAS signals associated with multifactorial traits, e.g. type 2 diabetes, were mapped outside the coding gene sequence, which imposes a barrier to understanding their identities and function as well as limits their usefulness in experimental studies2, 10. It is equally important to assess the reproducibility of reported genotype-phenotype association, as more of them failed to replicate. This was attributed to several issues, including inappropriate reliance on standard significant thresholds, small samples, and genotype and phenotype heterogeneity11, 12. At the advent of GWAS, it appeared a promising proposal to estimate disease-risk by capturing the profile of common genetic variants. Nevertheless, the majority of common variants identified by GWAS only possess a very moderate effect size, and even the sum of these genetic effects only accounts for a minor portion of estimated trait heritability26. To address this issue, the effort has been made to identify the variants with lower frequency but higher penetrance by using imputed variants as well as to explore gene-gene and gene-environment interactions26. Further such studies would be beneficial, with the awareness that GWAS studies are designed to find common SNPs associated with complex traits and thus may not reveal conclusive information. Even if multiple SNPs are identified, they may still not fully explain the relationship between genes and rotator cuff disease. GWAS studies that identify SNPs would also need to be replicable and use a consistent definition of the clinical phenotype of rotator cuff tears.

Conclusions

There is data suggesting a genetic predisposition to rotator cuff disease. A large GWAS study with adequate controls could discover SNPs associated with symptomatic rotator cuff tears. The results from such a study could assist with early detection of individuals at risk of developing non-traumatic tears or suggest mechanisms of idiopathic rotator cuff disease. This may lead to medical treatments or prophylactic rehabilitation therapies to avoid development of symptomatic rotator cuff tears.

Acknowledgments

Source of Funding: This study was funded by the Rehabilitation Research Experience for Medical Students (RREMS) Program from the Association of Academic Physiatrists (AAP).

Dr. Jain is supported by funding from National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) 1K23AR059199 and the Vanderbilt’s Institute for Clinical and Translational Research (VICTR).

The project was supported by CTSA award No. UL1TR00045 from the National Center for Advancing Translational Sciences. Its contents are solely the responsibility of the authors and do not necessarily represent official views of the National Center for Advancing Translational Sciences or the National Institutes of Health.

Footnotes

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