1. Hiroshima Univ Hosp, Hiroshima, Japan;
2. Japan Red Cross Wakayama Medical Center, Wakayama, Japan;
3. Japan Clinical Oncology Group Data Center, National Cancer Center, Tokyo, Japan;
4. University of Yamanashi, Chuo-Shi, Japan;
5. Kobe City Medical Center General Hospital, Kobe, Japan;
6. Department of Radiation Oncology, Tokyo Metropolitan Cancer and Infectious diseases Center Komagome Hospital, Tokyo, Japan;
7. Ion Beam Therapy Center, SAGA HIMAT Foundation, Tosu, Japan;
8. Department of Radiology, Hokkaido University Graduate School of Medicine, Sapporo, Japan;
9. Tokai University, Kanagawa, Japan;
10. Nagoya City University, Nagoya, Japan;