1. From the Department of Medicine, Veterans Affairs Medical Center, Washington, DC (C.F., M.D., A.P., P.N., A.T., P.K.); Department of Cardiology, School of Medicine, Georgetown University, Washington, DC (P.K.); Department of Medicine, School of Medicine, George Washington University, Washington, DC (C.F., M.D., A.P., P.N., P.K.); and Department of Cardiology, Veterans Affairs Palo Alto Health Care System and Stanford University, CA (J.M.).