1. From the Department of Neurology (R.G., N.A.V., A.H.T., M.D.H., K.U., L.R.W., T.G.J.), Stroke Institute, University of Pittsburgh Medical Center, Pennsylvania; Departments of Neurosurgery and Radiology (M.B.H.), University of Pittsburgh Medical Center, Pennsylvania; VA Health Systems Pittsburgh (T.G.J.), University Drive, Pittsburgh, Pa; Department of Neurosurgery (E.I.L.), University of Buffalo, State University of New York.