1. Department of Obstetrics and Gynecology, School of Medicine, Keimyung University, Daegu, South Korea.
2. Department of Radiology, School of Medicine, Keimyung University, Daegu, South Korea.
3. Department of Anesthesiology, School of Medicine, Keimyung University, Daegu, South Korea.
4. Department of Pathology, School of Medicine, Keimyung University, Daegu, South Korea.