1. Department of Radiation Oncology, Graduate School of Medicine, Hirosaki University, 5 Zaifu-cho, Hirosaki 036-8562, Japan
2. Southern Tohoku BNCT Research Center, 7-10 Yatsuyamada, Koriyama 963-8052, Japan
3. Osaka Heavy-Ion Therapy Center, 3-1-10 Otemae, Chuo-ku, Osaka 540-0008, Japan