1. From the Cardiology Division, San Francisco VA Medical Center (M.A., E.C.P., B.M.M.); Departments of Medicine (M.A., M.G.S., D.V.O., B.M.M.) and Epidemiology and Biostatistics (M.G.S.) and Cardiovascular Research Institute (B.M.M.), University of California, San Francisco; Cardiology Division, Palo Alto VA Medical Center (P.A.H.); and California Pacific Medical Center Research Institute (W.S.B.), San Francisco, Calif.