1. From the Division of Interventional Neuroradiology (Z.-S.S., Y.L., N.R.G., S.T., R.J., L.F., G.R.D., F.V.), the Department of Neurology (D.S.L., J.L.S., L.K.A., B.O., D.K.,), the Department of Emergency Medicine (S.S.), and the Department of Neurosurgery (Y.L., P.M.V., C.M., N.R.G.), David Geffen School of Medicine at UCLA, Los Angeles, Calif; the Department of Neurosurgery (Z.-S.S.), The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, P.R. China; and the Neurovascular Service (Y.L.)...