1. From Evans Department of Medicine (M.A.F., R.L., R.T.E., C.C.L., J.L.), Department of Surgery (J.J.), and Whitaker Cardiovascular Institute (M.A.F., A.C., R.L., C.C.L., R.T.E., J.J., J.L.), Boston University School of Medicine, Boston, Mass; Cardiology Section, Department of Medicine (N.M.), The Ohio State University, Columbus, Ohio; and Duke University School of Medicine (P.G.), Durham, NC.