1. Department of Obstetrics and Gynecology, Cheil General Hospital and Women's Healthcare Center, Dankook University College of Medicine, Seoul, Korea.
2. Department of Obstetrics and Gynecology, Bundang Cheil Women's Healthcare Center, Seongnam, Korea.
3. Division of Endocrinology and Metabolism, Cheil General Hospital and Women's Healthcare Center, Dankook University College of Medicine, Seoul, Korea.