1. Department of Obstetrics and Gynecology, Korea University Ansan Hospital, Korea University School of Medicine, Ansan, Korea.
2. Department of Obstetrics and Gynecology, Research Institute of Medical Science, Konkuk University School of Medicine, Seoul, Korea.
3. Department of Obstetrics and Gynecology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.
4. Department of Obstetrics and Gynecology, Hanyang University Seoul Hospital, Hanyang University College of Medicine, Seoul, Korea.
5. Department of Obstetrics and Gynecology, Yongin Severance Hospital, Yonsei University College of Medicine, Yongin, Korea.
6. Department of Obstetrics and Gynecology, Chungnam National University Sejong Hospital, Chungnam National University College of Medicine, Sejong, Korea.
7. Department of Obstetrics and Gynecology, Ewha Womans University Mokdong Hospital, Ewha Womans University College of Medicine, Seoul, Korea.
8. Department of Obstetrics and Gynecology, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Korea.
9. Department of Obstetrics and Gynecology, Gachon University Gil Medical Center, Gachon University College of Medicine, Incheon, Korea.
10. Department of Obstetrics and Gynecology, Konkuk University Hospital, Konkuk University School of Medicine, Seoul Korea.
11. Department of Obstetrics and Gynecology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
12. Department of Obstetrics and Gynecology, Bucheon St. Mary’s Hospital, The Catholic University College of Medicine, Seoul, Korea.
13. Attorney at Law, SeSeung LLC, Seoul, Korea.
14. Department of Obstetrics and Gynecology, Kyung Hee University Hospital at Gangdong, Kyung Hee University College of Medicine, Seoul, Korea.