1. Department of Radiation Oncology, Southern Tohoku BNCT Research Center, 7-10 Yatsuyamada, Koriyama, Fukushima 963-8052, Japan
2. Department of Radiology and Radiation Oncology, Akita University Graduate School of Medicine, Hospital, 1-1-1 Hondo, Akita, Akita 010-8543, Japan
3. Department of Radiology and Radiation Oncology, Hirosaki University Graduate School of Medicine, 5 Zaifu-cho, Hirosaki, Aomori 036-8562, Japan
4. Particle Radiation Oncology Research Center, Kyoto University Research Reactor Institute, 2 Asashiro-nisi, Sennan-gun, Osaka 590-0494, Japan