1. From the Stroke Center and Department of Neurology (J.L.S., B.F., A.Y., S.C., M.C., S.S.), University of California, Los Angeles, Los Angeles, Calif; Stanford University, Palo Alto, Calif (S.H.); and the National Institute for Neurological Disorders and Stroke (R.C.), National Institutes of Health, Bethesda, Md.