1. Department of Neurosurgery, Yokohama Shintoshi Neurosurgical Hospital, Yokohama, Kanagawa, Japan
2. Department of Neurology and Neuroendovascular Treatment, Yokohama Shintoshi Neurosurgical Hospital, Yokohama, Kanagawa, Japan
3. Department of Neurosurgery, Toranomon Hospital, Tokyo, Japan