1. Division of Endocrinology, Diabetes, and Metabolism (S.M.P., A.R.C.), University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
2. Center for Clinical Epidemiology and Biostatistics (S.M.P., S.J.R., R.W., A.R.C.), University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
3. Cardiovascular Institute (M.P.R.), University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
4. Section of Endocrinology, Diabetes, and Nutrition (S.B.), Boston University School of Medicine, Boston, Massachusetts 02118
5. Research Service, Washington DC Veterans Affairs Medical Center (M.R.B.), Washington, D.C. 20422
6. Department of Epidemiology (J.A.C., K.S.-T.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261
7. Division of General Internal Medicine (J.R.), University of California, Davis, Sacramento, California 95817
8. Department of Epidemiology (L.P.F.), Mailman School of Public Health, Columbia University, New York, New York 10032