1. From the Division of Cardiovascular Medicine (K.T., J.M.S., A.C.D., M.U.W., T.Y., J.M., U.R., M.A., I.N.S., A.J., P.S.T.)
2. VA Palo Alto Health Care System, CA (K.T., J.M.S., A.C.D., K.W., M.U.W., T.Y., J.M., S.K., U.R., M.A., I.N.S., A.J., P.S.T.).
3. Department of Neurology and Neurological Sciences (T.-T.H., H.N.), Stanford University School of Medicine, CA