1. Medical Doctor, Department of Neurosurgery, NTT Medical Center Tokyo, 5-9-22 Higashii-Gotanda, Shinagawa-ku,Tokyo, Japan
2. Medical Doctor, Department of Neurosurgery and Neuro-Oncology, National Cancer Center Hospital, 5-1-1 Tsukiji, Chuo-ku, Tokyo, Japan
3. Chief Doctor, Department of Neurosurgery, Center Hospital of the National Center for Global Health and Medicine, 1-21-1 Toyama, Shinjuku-ku, Tokyo, Japan
4. Vice President, Department of Neurosurgery, Center Hospital of the National Center for Global Health and Medicine, 1-21-1 Toyama, Shinjuku-ku, Tokyo, Japan