1. From the Stroke Institute, Department of Neurology (T.G.J., J.M.G., S.G., L.R.W.); Department of Neurosurgery (H.Y., Y.F.C.); Department of Neuroradiology (E.K., S.Z.G.); and Department of Epidemiology (Y.F.C.), University of Pittsburgh Medical Center, Presbyterian University Hospital, Pittsburgh, Pa.