1. Department of Obstetrics and Gynecology, School of Medicine, CHA University
2. CHA fertility center, Seoul station, Jung-gu, Seoul 04637, Korea
3. Department of Statistics, Seoul National University, Gwanak-gu, Seoul 08826, Korea
4. Fertility Center of CHA Gangnam Medical Center, Gangnam-gu, Seoul 06135, Korea
5. Department of Cancer Control and Population Health, Graduate School of Cancer Science and Policy, National Cancer Center, Goyang, Gyeonggi-do, 10408, Korea