1. From the Department of Neurosurgery (M.S., A.M., T.K.), Faculty of Medicine, and the Institute of Industrial Science (M.S., M.O., R.T.), University of Tokyo, Japan; the Department of Neurosurgery (K.T.), Faculty of Medicine, Teikyo University, Japan; and the Departments of Neurosurgery (M.H.) and Radiology (K.K.), Faculty of Medicine, Fujita Health University, Japan.