1. Shizuoka Cancer Center Department of Gynecology, , Shizuoka, Japan
2. The Jikei University School of Medicine Department of Obstetrics and Gynecology, , Tokyo, Japan
3. National Cancer Centre Hospital Japan Clinical Oncology Group Data Centre/Operations Office, , Tokyo, Japan
4. National Cancer Center Hospital Department of Gynecology, , Tokyo, Japan
5. Department of Gynecologic Oncology, Cancer Institute Hospital of Japanese Foundation for Cancer Research , Tokyo, Japan
6. Chiba University Department of Reproductive Medicine, Graduate School of Medicine, , Chiba, Japan
7. Iwate Medical University School of Medicine Department of Obstetrics and Gynecology, , Iwate, Japan
8. Hyogo Cancer Center Department of Gynecologic Oncology, , Akashi, Japan
9. Juntendo University Department of Obstetrics and Gynecology, , Tokyo, Japan
10. National Cancer Center Hospital East Department of Gynecology, , Kashiwa, Japan
11. University of Tsukuba Department of Obstetrics and Gynecology, Faculty of Medicine, , Tsukuba, Japan