1. Juntendo University, Hongo Department of Radiation Oncology, , Bunkyo-ku, Japan
2. National Cancer Center Hospital Department of Radiation Oncology, , Tokyo, Japan
3. Kyoto Prefectural University of Medicine Department of Radiology, , Kyoto, Japan
4. Kansai Medical University Medical Center Department of Radiology, , Osaka, Japan
5. Saitama Medical University International Medical Center Department of Radiation Oncology, , Saitama, Japan
6. Graduate School of Medicine, Chiba University Diagnostic Radiology and Radiation Oncology, , Chiba, Japan
7. Ise Red Cross Hospital Department of Radiation Oncology, , Mie, Japan
8. Kyushu University Division of Medical Quantum Science, Department of Health Sciences, Graduate School of Medical Sciences, , Fukuoka, Japan
9. Tohoku University Graduate School of Medicine Department of Radiation Oncology, , Miyagi, Japan
10. National Cancer Center Hospital Radiation Safety and Quality Assurance Division, , Tokyo, Japan
11. Tokushima University Graduate School Department of Radiology, , Tokushima, Japan
12. Tokushima University Graduate School Institute of Biomedical Sciences, , Tokushima, Japan