1. Cardiovascular Institute and Division of Cardiology, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, MA (M.F.R., J.K.P., A.S.P., N.O., D.W., J.E.H.).
2. Division of Cardiology, Department of Medicine, Massachusetts General Hospital, Boston (E.S.L., J.N.M., R.M., G.D.L.).
3. Department of Biostatistics, Boston University School of Public Health, MA (D.W.).
4. Pulmonary and Critical Care, Division of Massachusetts General Hospital, Boston (J.N.M.).
5. Sections of Cardiovascular Medicine and Preventive Medicine and Epidemiology, Department of Medicine, Boston University School of Medicine, MA (M.N.).