1. From Duke University Medical Center, Department of Medicine, Cardiology Division, Durham, NC (P.J.G.-C., G.K.W.L., V.J.D.); Brigham and Women’s Hospital, Cardiovascular Division, and Harvard Medical School, Boston, Mass (M.A.C.); Division of Cardiovascular Research, St Elizabeth’s Medical Center, Tufts University School of Medicine, Boston, Mass (D.W.L.); and Division of Heart and Vascular Diseases, National Heart, Lung and Blood Institute, Bethesda, Md (M.W.).