1. Department of Obstetrics and Gynecology, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea.
2. Department of Biomedical Sciences, Korea University College of Medicine, Seoul, Korea.
3. Division of Developmental Biology and Physiology, School of Biosciences and Chemistry, Institute for Basic Sciences, Sungshin University, Seoul, Korea.
4. Department of Obstetrics and Gynecology, CHA Bundang Medical Center, CHA University College of Medicine, Seongnam, Korea.