1. Department of Radiation Oncology, Ion Beam Therapy Center, SAGA HIMAT Foundation, Tosu, Japan
2. Department of Radiology, Graduate School of Medicine, Yamanashi University, Yamanashi, Japan
3. Division of Radiation Oncology, Institute of Biomedical Research and Innovation, Kobe, Japan
4. Department of Radiation Oncology and Image-applied Therapy, Kyoto University, Kyoto, Japan
5. Department of Radiology, Ofuna Chuo Hospital, Kamakura, Japan
6. Department of Radiology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
7. Department of Radiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
8. Department of Radiation Oncology, National Cancer Center Hospital, Tokyo, Japan
9. Department of Radiology and Radiation Oncology, Graduate School of Medicine, Hirosaki University, Hirosaki, Japan
10. Department of Radiation Oncology, Graduate School of Medicine, Tohoku University, Sendai, Japan
11. Department of Radiation Oncology, Niigata Cancer Center Hospital, Niigata, Japan