1. Division of General Medicine, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan
2. Division of Metabolism, Endocrinology and Diabetes, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan
3. Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, California
4. Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, Georgia