1. Department of Obstetrics and Gynecology, Seoul National University College of Medicine, Seoul, Korea.
2. Department of Obstetrics and Gynecology, Dankook University Hospital, Cheonan, Korea.
3. Department of Obstetrics and Gynecology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
4. Center for Gynecologic Cancer, Research Institute and Hospital, National Cancer Center, Goyang, Korea.
5. Department of Obstetrics and Gynecology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
6. Department of Obstetrics and Gynecology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
7. Department of Obstetrics and Gynecology, Yonsei University College of Medicine, Seoul, Korea.
8. Gynecologic Cancer Center, Department of Obstetrics and Gynecology, Ajou University School of Medicine, Suwon, Korea.
9. Department of Obstetrics and Gynecology, Chung-Ang University College of Medicine, Seoul, Korea.
10. Department of Obstetrics and Gynecology, Research Institute of Medical Science, Konkuk University School of Medicine, Seoul, Korea.