1. Department of Radiation Oncology, National Hospital Organization Fukuyama Medical Center, Hiroshima, Japan
2. Department of Radiation Oncology, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan
3. Department of Obstetrics and Gynecology, Chugoku Rosai Hospital, Hiroshima, Japan
4. Department of Obstetrics and Gynecology, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan
5. Radiation and Proton Therapy Center, Shizuoka Cancer Center, Shizuoka, Japan
6. Department of Radiation Oncology, University of Tsukuba, Ibaraki, Japan
7. Department of Radiation Oncology, Fukaya Red Cross Hospital, Saitama, Japan
8. Department of Radiation Oncology, Saitama Cancer Center, Saitama, Japan
9. Department of Therapeutic Radiology, Tokushima University Graduate School, Tokushima, Japan
10. Department of Diagnostic Radiology and Radiation Oncology, Chiba University Graduate School of Medicine, Chiba, Japan
11. Hyogo Ion Beam Medical Center, Hyogo, Japan
12. Department of Radiology, Saga University, Saga, Japan
13. Department of Radiology, Kansai Medical University, Osaka, Japan
14. Radiation Oncology Center, St. Marianna University School of Medicine Hospital, Kanagawa, Japan
15. Radiation Therapy Center, Okinawa Chubu Hospital, Okinawa, Japan
16. Department of Radiology, Graduate School of Medical Science, University of the Ryukyus, Okinawa, Japan
17. Department of Radiology, Tokyo Metropolitan Tama Medical Center, Tokyo, Japan
18. Department of Radiation Oncology, Saitama Medical University International Medical Center, Saitama, Japan
19. Department of Radiation Oncology, Gunma University Graduate School of Medicine, Gunma, Japan
20. Department of Radiation Oncology, Saitama Medical University Saitama Medical Center, Saitama, Japan
21. Department of Radiation Oncology, National Hospital Organization Mito Medical Center, Ibaraki, Japan
22. Department of Gynecology, St. Marianna University School of Medicine, Toyoko Hospital, Tokyo, Japan
23. Department of Obstetrics and Gynecology, Mitsui Memorial Hospital, Tokyo, Japan
24. Department of Gynecology, Saitama Cancer Center, Saitama, Japan
25. Division of Gynecology, Shizuoka Cancer Center, Shizuoka, Japan
26. Department of Public Health, Kurume University School of Medtioicine, Fukuoka, Japan
27. Department of Epidemiology, Infectious Disease Control and Prevention, Graduate school of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan