1. Department of Obstetrics and Gynecology, National Cancer Center, Goyang, Korea
2. Department of Obstetrics and Gynecology, Seoul National University College of Medicine, Seoul, Korea
3. Department of Obstetrics and Gynecology, Healthcare System Gangnam Center, Seoul National University Hospital, Seoul, Korea
4. The Institute of Reproductive Medicine and Population, Medical Research Center, Seoul National University College of Medicine, Seoul, Korea
5. Department of Obstetrics and Gynecology, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea
6. Department of Obstetrics and Gynecology, IORA Fertility Clinic, Suwon, Korea