1. Department of Obstetrics and Gynecology, Kangseo Mizmedi Hospital, Seoul, Republic of Korea;
2. Department of Obstetrics and Gynecology, Kyungpook National University College of Medicine, Daegu, Republic of Korea;
3. Department of Obstetrics and Gynecology, Seoul National University College of Medicine, Seoul, Republic of Korea;
4. The Institute of Reproductive Medicine and Population, Medical Research Center, Seoul National University College of Medicine, Seoul, Republic of Korea;
5. Department of Obstetrics and Gynecology, Healthcare System Gangnam Center, Seoul National University Hospital, Seoul, Republic of Korea;
6. Department of Obstetrics and Gynecology, Konyang University College of Medicine, Daejeon, Republic of Korea;
7. Department of Obstetrics and Gynecology, Cheil General Hospital & Women’s Healthcare Center, Seoul, Republic of Korea;
8. Department of Obstetrics and Gynecology, Bundang Cheil Women’s Hospital, Bundang, Republic of Korea;
9. Department of Obstetrics and Gynecology, Seoul Rachel Fertility Center, Seoul, Republic of Korea