1. Department of Obstetrics and Gynecology, CHA Gangnam Medical Center CHA University School of Medicine Seoul Republic of Korea
2. Department of Obstetrics and Gynecology Seoul National University Bundang Hospital Seongnam Republic of Korea
3. Department of Obstetrics and Gynecology Seoul St. Mary's Hospital, The Catholic University of Korea Seoul Republic of Korea
4. Department of Obstetrics and Gynecology, Samsung Medical Center Sungkyunkwan University School of Medicine Seoul Republic of Korea
5. Department of Obstetrics and Gynecology Seoul Metropolitan Government Seoul National University Boramae Medical Center Seoul Republic of Korea
6. Department of Obstetrics and Gynecology International St. Mary's Hospital, Catholic Kwandong University College of Medicine Incheon Republic of Korea
7. Department of Obstetrics and Gynecology, Division of Gynecologic Oncology, CHA Bundang Medical Center CHA University Seoul Republic of Korea
8. Department of Obstetrics and Gynecology Samsung Changwon Hospital, Sungkyunkwan University of Medicine Changwon Republic of Korea
9. Department of Obstetrics and Gynecology, School of Medicine Kyungpook National University Daegu Republic of Korea
10. Department of Obstetrics and Gynecology Pusan National University School of Medicine Yangsan Republic of Korea