1. Department of Obstetrics and Gynecology, Inha University Hospital, Inha University College of Medicine, Incheon, Korea.
2. Department of Obstetrics and Gynecology, Ajou University School of Medicine, Suwon, Korea.
3. Department of Obstetrics and Gynecology, Kyung Hee University Medical Center, School of Medicine, Kyung Hee University, Seoul, Korea.
4. Center for Gynecologic Cancer, Research Institute and Hospital, National Cancer Center, Goyang, Korea.
5. Department of Obstetrics and Gynecology, Ewha Womans University Mokdong Hospital, Ewha Womans University College of Medicine, Seoul, Korea.
6. Department of Obstetrics and Gynecology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
7. Department of Obstetrics and Gynecology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
8. Department of Obstetrics and Gynecology, Yongin Severance Hospital, Yonsei University College of Medicine, Yongin, Korea.
9. Department of Obstetrics and Gynecology, Yonsei University College of Medicine, Seoul, Korea.
10. Department of Obstetrics and Gynecology, Seoul National University Bundang Hospital, Seongnam, Korea.