1. Division of Health Services Research, Center for Cancer Control and Information Services, National Cancer Center, Tokyo, Japan.
2. Department of Obstetrics and Gynecology, Tokai University, Kanagawa, Japan.
3. Department of Obstetrics and Gynecology, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan.
4. Department of Radiation Oncology, Saitama Medical University International Medical Center, Saitama, Japan.
5. Department of Obstetrics and Gynecology, Otaru General Hospital, Hokkaido, Japan.
6. Department of Medical Oncology, Tohoku University Hospital, Miyagi, Japan.
7. Department of Obstetrics and Gynecology, Kindai University Faculty of Medicine, Osaka, Japan.
8. Department of Obstetrics and Gynecology, Yamagata University Faculty of Medicine, Yamagata, Japan.
9. Department of Obstetrics and Gynecology, Tohoku University, Miyagi, Japan.
10. Department of Gynecology and Obsteterics, Kyoto University Graduate School of Medicine, Kyoto, Japan.
11. Division of Gynecology, Shizuoka Cancer Center Hospital, Shizuoka, Japan.
12. Department of Pathology, Okayama University Hospital, Okayama, Japan.
13. Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan.