1. Department of Pediatrics, Chungnam National University Sejong Hospital, Sejong 30099, Republic of Korea
2. Department of Pediatrics, School of Medicine, Chungnam National University, Daejeon 34134, Republic of Korea
3. Department of Pediatrics, Chungnam National University Hospital, Daejeon 35015, Republic of Korea
4. Department of Radiology, Chungnam National University Sejong Hospital, Sejong 30099, Republic of Korea