1. Division of Endocrinology, Diabetes, and Metabolism (A.R.C.), University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104-6021
2. Center for Clinical Epidemiology and Biostatistics (A.R.C., S.J.R.), University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104-6021
3. Section of Endocrinology (S.B.), Boston University, Boston, Massachusetts 02118
4. Endocrine Section, Laboratory of Clinical Investigation, National Center for Complementary and Alternative Medicine (M.R.B.), National Institutes of Health, Bethesda, Maryland 20892
5. Department of Epidemiology (J.C., J.M.Z.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261
6. Division of General Internal Medicine (J.R.), University of California, Davis, Sacramento, California 95817
7. Laboratory of Epidemiology, Demography and Biometry, National Institute on Aging (T.H.), National Institutes of Health, Bethesda, Maryland 20892
8. Division of Geriatric Medicine and Gerontology and Center on Aging and Health (L.P.F.), Johns Hopkins Medical Institutions, Baltimore, Maryland 21205