1. From the Division of Preventive Medicine (P.M.R., J.E.B., J.M.G., T.K.), the Division of Aging (J.E.B., J.M.G., T.K.), Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, Mass; the Department of Epidemiology (P.M.R., J.E.B., T.K.), Harvard School of Public Health, Boston, Mass; Massachusetts Veterans Epidemiology and Research Information Center (J.M.G.), Boston Veterans Affairs Healthcare System, Jamaica Plain, Mass; Institute of Epidemiology and Social Medicine (K...