1. Department of Obstetrics and Gynecology, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
2. Department of Obstetrics and Gynecology, Kyung Hee University School of Medicine, Kyung Hee University Hospital at Gangdong, Seoul, Korea.
3. Department of Obstetrics and Gynecology, Institute of Women’s Medical Life Science, Yonsei University College of Medicine, Yonsei University Health System, Seoul, Korea.
4. Division of Maternal and Fetal Medicine, Department of Obstetrics and Gynecology, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul, Korea.
5. Department of Obstetrics and Gynecology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
6. Department of Obstetrics and Gynecology, Eunpyeong St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
7. Department of Obstetrics and Gynecology, Seoul National University College of Medicine, Seoul, Korea.
8. Department of Obstetrics and Gynecology, School of Medicine, Kyungpook National University, Daegu, Korea.
9. Department of Obstetrics and Gynecology, Inha University College of Medicine, Incheon, Korea.
10. Department of Obstetrics and Gynecology, Pusan National University College of Medicine, Busan, Korea.
11. Department of Obstetrics and Gynecology, Dongguk University Ilsan Hospital, Goyang, Korea.
12. Department of Obstetrics and Gynecology, Kangwon National University Hospital, School of Medicine, Kangwon National University, Chuncheon, Korea.
13. Department of Obstetrics and Gynecology, Incheon St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
14. Department of Obstetrics and Gynecology, College of Medicine, Ewha Womans University, Seoul, Korea.
15. Family Medicine Residency, Providence St. Joseph Eureka Hospital, Eureka, CA, USA.