1. From the Michael E. DeBakey VA Medical Center, Houston, TX (H.J., B.K., D.P., A.B., L.C., G.N.L., N.A., C.F.B., P.K., P.V.A., C.P., B.C., B.B., F.G.B.); and the Division of Cardiology, Department of Medicine (H.J., B.K., D.P., A.B., G.N.L., N.A., B.C., B.B.), and Divisions of Cardiothoracic Surgery (L.C., F.G.B.) and Vascular Surgery (C.F.B., P.K.), Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX.