1. Department of Obstetrics and Gynecology, Korea University Guro Hospital, Seoul, Korea.
2. Comprehensive Gynecologic Cancer Center, CHA Bundang Medical Center, CHA University, Seongnam, Korea.
3. Department of Obstetrics and Gynecology, Institute of Women’s Life Medical Science, Yonsei University College of Medicine, Seoul, Korea.
4. Department of Obstetrics and Gynecology, Seoul National University College of Medicine, Seoul, Korea.
5. Department of Obstetrics and Gynecology, Keimyung University School of Medicine, Daegu, Korea.
6. Department of Obstetrics and Gynecology, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
7. Department of Obstetrics and Gynecology, Ajou University School of Medicine, Suwon, Korea.
8. Department of Obstetrics and Gynecology, Asan Medical Center, University of Ulsan, Seoul, Korea.