1. Division of Cardiology (S.K.)
2. Cardiovascular Research Center (S.H.C., L.-C.W., E.Y.W., P.T.E., S.A.L.)
3. Massachusetts General Hospital, Boston. Department of Biostatistics, Boston University School of Public Health, MA (L.T.)
4. Boston University and National Heart, Lung, and Blood Institute’s Framingham Heart Study, MA (L.T., E.J.B.).
5. Sections of Preventive Medicine and Cardiovascular Medicine, Department of Medicine, Boston University School of Medicine, MA (E.J.B.)
6. Department of Epidemiology, Boston University School of Public Heath, MA (E.J.B.).
7. Cardiac Arrhythmia Service (P.T.E., S.A.L.)