1. University of Iowa Carver College of Medicine, Iowa City, Iowa
2. Arbor Research Collaborative for Health, Ann Arbor, Michigan
3. University of Michigan, Ann Arbor, Michigan
4. Washington University School of Medicine, St. Louis, Missouri
5. University of Washington, Seattle, Washington
6. National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland