1. From the Department of Neurological Science, Nippon Medical School Hospital, Tokyo, Japan (K.S., J.A., S.S., Y.N., K.K.)
2. Departments of Neurology (N.N., S.H.)
3. Neurosurgery (K.K.)
4. Kitamurayama Hospital, Yamagata, Japan; Department of Neurology, Jusendo General Hospital, Fukushima, Japan (Y.S., H.H.)
5. Department of Neurology, Shioda Hospital, Chiba, Japan (K.N., T.H.).