1. From the VA Palo Alto Health Care System, Palo Alto, CA (P.A.H., S.L., A.S.); Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, CA (P.A.H., J.W.K., M.P., R.M.W.); VA Eastern Colorado Health Care System, Denver, CO (T.M.M., M.P.H., J.S.R., T.T.T.); and San Francisco VA Medical Center, San Francisco, CA (B.M.M.).