1. From the Department of Medicine, Michael E. DeBakey Veterans Affairs Hospital, Houston, TX (S.S.V., B.B., V.N.); Baylor College of Medicine, Houston, TX (Y.P., W.S., G.E.T., S.S.V., R.C.H., B.B., C.M.B., V.N.); Department of Medicine, Methodist DeBakey Heart Center, Houston, TX (Y.P., S.S.V., R.C.H., C.M.B., V.N.); Department of Medicine, University of Texas Southwestern Medical Center, Dallas (J.A.d.L.); Cardiovascular Research Institute, Baylor College of Medicine, Houston, TX (S.S.V., B.B., C.M.B...