1. Research Center of Boron Neutron Capture Therapy, Osaka Prefecture University, 1-1, Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
2. Stella Pharma Co., ORIX Kouraibashi Bldg., 3-2-7 Kouraibashi, Chuo-ku, Osaka 541-0043, Japan
3. Department of Neurosurgery, Osaka Medical and Pharmaceutical University, 2-7 Daigaku-machi, Takatsuki-shi, Osaka 569-8686, Japan