1. Arbor Research Collaborative for Health, Ann Arbor, Michigan
2. University of Washington, Seattle, Washington
3. Duke University Medical Center, Durham, North Carolina
4. University of Michigan, Ann Arbor, Michigan
5. Washington University School of Medicine, St. Louis, Missouri
6. Northwestern University Feinberg School of Medicine, Chicago
7. NorthShore University Health System, Glenview, Illinois
8. National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland