1. From the Departments of Anesthesia and Perioperative Care (T.H., G.W., G-Y.Y., W.L.Y.), Neurological Surgery (M.T.L., N.M.B., R.T.H., C.F.D., V.V.H., W.L.Y.), Surgery (N.J.B.), Pathology (A.W.B.), Radiology (R.T.H., C.F.D.), and Neurology (W.L.Y.), and the Center for Cerebrovascular Research (T.H., G.W., G-Y.Y., W.L.Y.), University of California, San Francisco.