1. Department of Obstetrics and Gynecology, CHA Gangnam Medical Center, CHA University School of Medicine, Seoul, Korea.
2. Department of Obstetrics and Gynecology, Pusan National University Hospital, Busan, Korea.
3. Center for Uterine Cancer, Research Institute and Hospital, National Cancer Center, Goyang, Korea.
4. Department of Obstetrics and Gynecology, Keimyung University School of Medicine, Daegu, Korea.
5. Department of Obstetrics and Gynecology, Ajou University School of Medicine, Suwon, Korea.
6. Department of Obstetrics and Gynecology, Chungbuk National University Hospital, Cheongju, Korea.
7. Department of Obstetrics and Gynecology, Seoul National University College of Medicine, Seoul, Korea.
8. Department of Obstetrics and Gynecology, Seoul National University Bundang Hospital, Seongnam, Korea.