1. Department of Obstetrics and Gynecology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
2. Department of Obstetrics and Gynecology, Chonnam National University Medical School, Gwangju, Korea.
3. Department of Obstetrics and Gynecology, Dong-A University Medical Center, Busan, Korea.
4. Department of Obstetrics and Gynecology, Inje University Haeundae Paik Hospital, Busan, Korea.
5. Department of Obstetrics and Gynecology, Chungbuk National University Hospital, Cheongju, Korea.
6. Department of Obstetrics & Gynecology, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea.
7. Department of Obstetrics and Gynecology, Pusan National University Hospital, Busan, Korea.
8. Department of Obstetrics and Gynecology, Seoul National University Bundang Hospital, Seongnam, Korea.
9. Center for Gynecologic Cancer, National Cancer Center, Goyang, Korea.
10. Department of Obstetrics and Gynecology, Samsung Medical Center, Seoul, Korea.
11. Department of Obstetrics and Gynecology, Soonchunhyang University Seoul Hospital, Seoul, Korea.
12. Department of Obstetrics and Gynecology, The Catholic University of Korea College of Medicine, Seoul, Korea.
13. Department of Obstetrics and Gynecology, Korea University College of Medicine, Seoul, Korea.
14. Department of Obstetrics and Gynecology, Yonsei University College of Medicine, Seoul, Korea.