1. Department of Obstetrics and Gynecology, New York University Langone Medical Center, New York, NY, USA
2. Department of Obstetrics and Gynecology, Soonchunhyang University College of Medicine, Cheonan, Republic of Korea
3. Department of Obstetrics and Gynecology, Soonchunhyang University College of Medicine, Seoul, Republic of Korea
4. Department of Obstetrics and Gynecology, Soonchunhyang University College of Medicine, Bucheon, Republic of Korea