1. From the Division of Preventive Medicine (C.M.A., C.U.C., K.M.R., J.E.M.) and Channing Laboratory (J.E.M., I.K.), Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School; the Cardiology Division (C.M.A., C.U.C.), Department of Medicine, Massachusetts General Hospital and Harvard Medical School; and the Departments of Epidemiology (J.E.M.) and Society, Human Development, and Health (I.K.), Harvard School of Public Health, Boston, Mass.