1. Department of Obstetrics and Gynecology, Korea University College of Medicine, Seoul, Korea.
2. Department of Obstetrics and Gynecology, Seoul National University Bundang Hospital, Seongnam, Korea.
3. Department of Obstetrics and Gynecology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
4. Department of Obstetrics and Gynecology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
5. Medical Affairs Women’s Healthcare, Bayer Korea Ltd. Pharmaceutical, Seoul, Korea.