1. From the Center for Human Genetics (C.J.R., E.M., C.T.B.) and the Department of Medicine (E.M., J.C., H.G., C.T.B.), Boston University School of Medicine, Boston, Mass; the Department of Biostatistics (A.L.D.), Boston University School of Public Health, Boston, Mass; the Departments of Preventive Medicine and Internal Medicine (G.L.B.), Rush-Presbyterian–St. Luke’s Medical Center, Chicago, Ill; and the Cardiology Division (A.J.M.), Tzanion Hospital, Piraeus, Greece.