1. From the Division of Cardiovascular Medicine (A.H., S.B.), University of Cincinnati College of Medicine, Cincinnati, Ohio; Department of Internal Medicine (K.S.D., J.R.C., M.D.R.-C.), University of Wisconsin Hospital and Clinics and William S. Middleton VA Hospital, Madison, Wis; Division of Cardiology (Z.S.), Duke University Medical Center, Durham, NC; and Methodist DeBakey Heart and Vascular Center (S.M.C.), Houston, Tex.