1. Research Institute for Science and Engineering, Waseda University, Shinjuku-ku, Tokyo, Japan
2. Department of Neurosurgery, Kobe University Graduate School of Medicine, Kobe-shi, Hyogo, Japan
3. Shinsuma General Hospital, Kobe-shi, Hyogo, Japan
4. Japan Synchrotron Radiation Research Institute, Sayo-gun, Hyogo, Japan
5. Medical Corporation YUKOUKAI Clinic, Funabashi-shi, Chiba, Japan