1. Department of Obstetrics and Gynecology, Chung-Ang University College of Medicine, Seoul, South Korea
2. Department of Radiology, Chung-Ang University College of Medicine, Seoul, South Korea
3. Department of Pathology, Chung-Ang University College of Medicine, Seoul, South Korea
4. Department of Internal Medicine, Chung-Ang University College of Medicine, Seoul, South Korea