1. Department of Obstetrics and Gynecology, Gachon University Gil Medical Center, Gachon University College of Medicine, Incheon 21565, Republic of Korea
2. Department of Obstetrics and Gynecology, Women’s Cancer Clinic, Institute of Women’s Life Science, Yonsei University College of Medicine, Seoul 03722, Republic of Korea
3. Department of Obstetrics and Gynecology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505, Republic of Korea
4. Department of Obstetrics and Gynecology, Fertility Center of CHA Gangnam Medical Center, CHA University School of Medicine, Seoul 13496, Republic of Korea
5. Department of Obstetrics and Gynecology, Keimyung University School of Medicine, Daegu 42601, Republic of Korea
6. Department of Obstetrics and Gynecology, Chonnam National University Medical School, Gwangju 61469, Republic of Korea
7. Department of Obstetrics and Gynecology, Chungnam National University Hospital, Chungnam National University College of Medicine, Daejeon 34134, Republic of Korea
8. Department of Obstetrics and Gynecology, Inje University, Haeundae Paik Hospital, Busan 48108, Republic of Korea