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