1. Department of Neurosurgery, Yokohama Sakae Kyosai Hospital, Yokohama, Kanagawa, Japan
2. Department of Neurology, Yokohama Sakae Kyosai Hospital, Yokohama, Kanagawa, Japan
3. Department of Pathology, Yokohama Sakae Kyosai Hospital, Yokohama, Kanagawa, Japan