1. Department of Pediatrics, Cheil General Hospital & Women's Health Care Center, Dankook University College of Medicine, Seoul, Korea.
2. Department of Obsterics and Gynecology, Cheil General Hospital & Women's Health Care Center, Dankook University College of Medicine, Seoul, Korea.
3. Department of Pathology, Cheil General Hospital & Women's Health Care Center, Dankook University College of Medicine, Seoul, Korea.