1. From the Division of Cardiology (P.C.P., R.P., A.K., J.A.L., J.A.B., S.G., P.P.A.M., M.H.D., D.W.M.), Donald W. Reynolds Cardiovascular Clinical Research Center (C.R.A., R.P., A.K., J.A.L., M.H.D. D.W.M.), University of Texas Southwestern Medical Center, Dallas, Tex; and Brigham and Women’s Hospital (S.A.M.), Boston, Mass.