1. Department of Obstetrics and Gynecology, Konkuk University School of Medicine, Seoul, Korea.
2. Department of Obstetrics and Gynecology, Cheil General Hospital & Women's Healthcare Center, Dankook University College of Medicine, Seoul, Korea.
3. Department of Pathology, Cheil General Hospital & Women's Healthcare Center, Dankook University College of Medicine, Seoul, Korea.
4. Laboratory of Research and Development for Genomics, Cheil General Hospital and Women's Healthcare Center, Dankook University College of Medicine, Seoul, Korea.
5. Department of Health Science, Hanyang University, Seoul, Korea.