1. Division of Cardiology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA (I.R.).
2. Northeast Medical Group, Yale New Haven Hospital, New Haven, CT (M.J.B.).
3. Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA (R.F., R.A., N.C., L.A.L., S.P.J.).
4. Department of Cardiology, Brigham and Women's Hospital, Boston, MA (R.A.).
5. Section of Cardiology, Department of Medicine, Baylor College of Medicine, Houston, TX (M.A.R.).
6. Division of Cardiology, Department of Medicine, Johns Hopkins Medical Institutions, Baltimore, MD (A.P.J.).
7. Hinda and Arthur Marcus Institute for Aging Research at Hebrew SeniorLife, Boston, MA (L.A.L.).