1. Department of Obstetrics and Gynecology, Jichi Medical University, Tochigi, Japan.
2. Department of Biostatistics, School of Medicine, Yokohama City University, Kanagawa, Japan.
3. Department of Obstetrics and Gynecology, National Defense Medical College, Saitama, Japan.
4. Department of Gynecologic Oncology, Saitama Medical University International Medical Center, Saitama, Japan.
5. Department of Obstetrics and Gynecology, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan.
6. Department of Obstetrics and Gynecology, Gunma University Graduate School of Medicine, Gunma, Japan.
7. Department of Obstetrics and Gynecology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.
8. Department of Obstetrics and Gynecology, Saitama Medical Center, Saitama Medical University, Saitama, Japan.
9. Department of Obstetrics and Gynecology, Dokkyo Medical University Saitama Medical Center, Saitama, Japan.
10. Department of Gynecology, Gunma Prefectural Cancer Center, Gunma, Japan.
11. Department of Gynecologic Oncology, Hyogo Cancer Center, Hyogo, Japan.
12. Department of Gynecology, National Cancer Center Hospital, Tokyo, Japan.
13. Department of Obstetrics and Gynecology, Shin-Yurigaoka General Hospital, Kanagawa, Japan.