1. Department of Obstetrics and Gynecology, The University of Tokyo, Tokyo, Japan.
2. Department of Gynecologic Oncology, Saitama Medical University International Medical Center, Saitama, Japan.
3. Department of Obstetrics and Gynecology, Tokyo Medical and Dental University, Tokyo, Japan.
4. Department of Obstetrics and Gynecology, NTT Medical Center Tokyo, Tokyo, Japan.
5. Department of Obstetrics and Gynecology, Yokohama City University Graduate School of Medicine, Yokohama, Japan.
6. Department of Obstetrics and Gynecology, Nara Medical University, Nara, Japan.
7. Department of Obstetrics and Gynecology, Kinki University Faculty of Medicine, Osakasayama, Japan.
8. Department of Gynecology, Cancer Institute Hospital, Tokyo, Japan.
9. Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan.
10. Department of Obstetrics and Gynecology, Jikei University Kashiwa Hospital, Kashiwa, Japan.
11. Department of Obstetrics and Gynecology, Tokai University School of Medicine, Isehara, Japan.
12. Department of Obstetrics and Gynecology, Tohoku University Graduate School of Medicine, Sendai, Japan.