1. Department of Obstetrics and Gynecology, University of Ulsan College of Medicine, Ulsan University Hospital, Ulsan 44033, Republic of Korea
2. Department of Laboratory Medicine, Keimyung University School of Medicine, Daegu 42601, Republic of Korea
3. Department of Obstetrics and Gynecology, Keimyung University School of Medicine, Daegu 42601, Republic of Korea
4. Department of Pediatrics, Keimyung University School of Medicine, Daegu 42601, Republic of Korea
5. Department of Radiology, Keimyung University School of Medicine, Daegu 42601, Republic of Korea