1. Department of Medicine, General Medicine Division, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
2. Boston University School of Medicine and Framingham Heart Study, Framingham, Massachusetts
3. Diabetes Unit, Department of Medicine, Massachusetts Hospital and Harvard Medical School, Boston, Massachusetts
4. Department of Mathematics, Statistics, and Consulting Unit, Boston University, Boston, Massachusetts
5. Division of Clinical Epidemiology, Department of Medicine, University of Texas Health Science Center, San Antonio, Texas