1. Northwestern University Feinberg School of Medicine, Chicago, Illinois
2. Arbor Research Collaborative for Health, Ann Arbor, Michigan
3. National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland
4. Medical College of Wisconsin, Milwaukee, Wisconsin
5. University of Iowa Carver College of Medicine, Iowa City, Iowa
6. Duke University Medical Center, Durham, North Carolina
7. University of Michigan, Ann Arbor, Michigan
8. NorthShore University Health System, Glenview, Illinois