1. Department of Pediatrics, Ajou University Hospital, Ajou University School of Medicine, Suwon, Korea.
2. Department of Pediatrics, Keimyung University Dongsan Hospital, Keimyung University School of Medicine, Daegu, Korea.
3. Education Support Center, Keimyung University School of Medicine, Daegu, Korea.
4. Medical Research Collaboration Center in Kyungpook National University Hospital, Department of Medical Informatics, School of Medicine, Kyungpook National University, Daegu, Korea.