1. Department of Radiation Oncology, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036‑8562, Japan
2. Hirosaki University School of Medicine, Hirosaki, Aomori 036‑8562, Japan
3. Department of Internal Medicine, Kodomari Clinic, Kitatsugaru‑gun, Aomori 037‑0512, Japan
4. Department of Radiation Oncology, Sumitomo Hospital, Osaka, Osaka 530‑0005, Japan
5. Department of Radiation Oncology, Southern Tohoku BNCT Research Center, Koriyama, Fukushima 963‑8563, Japan