1. Department of Obstetrics and Gynecology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea;
2. Department of Obstetrics and Gynecology, Cheil General Hospital and Women’s Healthcare Center, Dankook University College of Medicine, Seoul, Korea;
3. Laboratory of Medicine Genetics, Medical Research Institute, Cheil General Hospital and Women’s Healthcare Center, Dankook University College of Medicine, Seoul, Korea;
4. Department of Obstetrics and Gynecology, Ajou University School of Medicine, Suwon, Korea