1. Division of Cardiology, Department of Medicine, Columbia University Vagelos College of Physicians and Surgeons, New York (G.S., M.A.F., K.A., F.L., M.Y., D.K., P.C.C., M.S.M., N.U.).
2. Division of Cardiology, Department of Internal Medicine, Weill Cornell Medical College, New York (E.M.H., C.G., I.S.).
3. Department of Surgery (A.K.), Columbia University Vagelos College of Physicians and Surgeons, New York.
4. New York-Presbyterian Hospital (N.K., E.L., C.H.).
5. Division of Cardiothoracic and Vascular Surgery, Department of Surgery (K.T., Y.N.), Columbia University Vagelos College of Physicians and Surgeons, New York.