1. From the Division of Neurosurgery, Department of Surgery (G.K.C.W., F.L.Y.H., W.S.P.), Department of Imaging and Interventional Radiology (R.C.H.N., J.C.M.S., D.W., J.A.), and Division of Neurology, Department of Medicine and Therapeutics (V.C.T.M., A.W.), Prince of Wales Hospital, Chinese University of Hong Kong, Hong Kong, China; and Department of Diagnostic Radiology, Kwong Wah Hospital, Hong Kong, China (D.Y.W.S.).