1. From the Harvard-Thorndike Laboratory of the Department of Medicine, Cardiovascular Division (F.A.J., S.K.C., K.V.K., C.S., R.M.B., D.L., W.J.M.), and the Department of Radiology (W.J.M.), Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Mass; the National Heart, Lung, and Blood Institute’s Framingham Heart Study (C.J.O., M.G.L., M.J.K., D.L.), Framingham, Mass; and the Cardiology Division (F.A.J., C.J.O.), Department of Internal Medicine, Massachusetts General Hospital, Harvard...