1. Division of Pediatric Surgery, Department of Surgery, Keimyung University School of Medicine, Daegu, Korea.
2. Department of Obstetrics & Gynecology, Keimyung University School of Medicine, Daegu, Korea.
3. Department of Urban Planning, Keimyung University, Daegu, Korea.
4. Division of Pediatric Surgery, Department of Surgery, Pusan National University Yangsan Hospital, Gyeongnam, Korea.