1. Endocrine Unit (J.S.F., R.M.N.), Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts 02114
2. Department of Epidemiology (S.E.B., V.M., J.M.J., J.A.C., M.E.D.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261
3. Division of Geriatrics (G.A.G.), University of California, Los Angeles, School of Medicine, Los Angeles, California 90095
4. Departments of Epidemiology and Biostatistics (M.R.S.), School of Public Health, University of Michigan, Ann Arbor, Michigan 48109
5. Division of Research (B.E., J.C.L.), Kaiser Permanente Northern California, Oakland, California 94612