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