1. Department of Radiation Oncology; Nagoya Proton Therapy Center; Nagoya City West Medical Center; Nagoya Japan
2. Department of Radiology; Nagoya City University Graduate School of Medical Sciences; Nagoya Japan
3. Department of Radiation Oncology; Faculty of Medicine; University of Tsukuba; Tsukuba Japan
4. Department of Radiation Oncology; Sapporo Teishinkai Hospital; Sapporo Japan
5. Department of Radiology; Hyogo Ion Beam Medical Center; Tatsuno Japan
6. Proton Therapy Division; Shizuoka Cancer Center Hospital; Nagaizumi Japan
7. Division of Radiation Oncology and Particle Therapy; National Cancer Center Hospital East; Kashiwa Japan
8. Department of Radiation Oncology; Southern TOHOKU Proton Therapy Center; Koriyama Japan
9. Medipolis Proton Therapy and Research Center; Ibusuki Japan
10. Proton Therapy Center; Fukui Prefectural Hospital; Fukui Japan
11. Proton Therapy Center; Aizawa Hospital; Matsumoto Japan
12. Department of Clinical Trial and Clinical Epidemiology; Faculty of Medicine; University of Tsukuba; Tsukuba Japan
13. Department of Radiation Oncology; Hamamatsu University School of Medicine; Hamamatsu Japan
14. Department of Radiation Medicine; Hokkaido University Graduate School of Medicine; Sapporo Japan