1. Department of Obstetrics and Gynecology, Seoul National University College of Medicine, Seoul, Korea.
2. Department of Obstetrics and Gynecology, CHA Gangnam Medical Center, CHA University, Seoul, Korea.
3. Department of Obstetrics and Gynecology, MizMedi Hospital, Seoul, Korea.
4. Department of Obstetrics and Gynecology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
5. Department of Obstetrics and Gynecology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
6. Department of Obstetrics and Gynecology, Institute of Women’s Life Medical Science, Yonsei University College of Medicine, Yonsei University Health System, Seoul, Korea.
7. Department of Obstetrics and Gynecology, Korea University College of Medicine, Seoul, Korea.
8. Department of Obstetrics and Gynecology, Konkuk University School of Medicine, Seoul, Korea.
9. Department of Obstetrics and Gynecology, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul, Korea.
10. Department of Obstetrics and Gynecology, Ewha Womans University, Seoul, Korea.
11. Department of Obstetrics and Gynecology, Bundang CHA Hospital, CHA University School of Medicine, Seongnam, Korea.
12. Department of Obstetrics and Gynecology, Catholic University of Korea College of Medicine, Seoul, Korea.
13. Medical Research Collaborating Center, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul, Korea.
14. Department of Obstetrics and Gynecology, Kangwon National University Hospital, Kangwon National University School of Medicine, Chuncheon, Korea.
15. Department of Obstetrics and Gynecology, Seoul National University Hospital, Seoul, Korea.
16. Innovative Medical Technology Research Institute, Seoul National University Hospital, Seoul, Korea.