1. From the Cardiovascular Division (G.J.B., R.J.O., E.K.Y., M.G., P.M.R., P.L., R.T.L.) and the Leducq Center for Cardiovascular Research (G.J.B., R.J.O., N.V., U.S., M.G., P.M.R., P.L., R.T.L.), Brigham and Women’s Hospital, and the Department of Radiology (M.A.B.), Massachusetts General Hospital, Harvard Medical School, Boston, Mass.