1. From the Departments of Anesthesia and Perioperative Care (F.S., Y.F., Y.C., Y.Z., W.L., W.L.Y., G.-Y.Y.), Neurological Surgery (W.L.Y., G.-Y.Y.), Neurology (W.L.Y.), and Internal Medicine (H.S.), Center for Cerebrovascular Research, University of California, San Francisco, Calif; and the Department of Neurology (F.S., G.-Y.Y.), RuiJin Hospital, Jiaotong University, Shanghai, China.