1. From the Departments of Neurosurgery (S.Y., K.U., M.B., F.S., N. Kinjo) and Clinical Epidemiology (K.U., F.S., N. Kinjo, T.S., T.M.), Hyogo College of Medicine, Nishinomiya, the Departments of Neurosurgery (N.S., H.I.) and Diagnostic Radiology (R.I.), Kobe City Medical Center General Hospital, Kobe, the Department of Stroke Neurology, National Hospital Organization Osaka National Hospital, Osaka (H.Y.), the Department of Cerebrovascular Medicine, National Cerebral and Cardiovascular Center, Suita (K.T.,...