1. Department of Pediatrics, Daejeon Eulji Medical Center, Eulji University, Daejeon, Korea
2. Department of Pediatrics, Ajou University School of Medicine, Suwon, Korea
3. Department of Pediatrics, School of Medicine, Kyungpook National University, Daegu, Korea
4. Department of Pediatrics, Soonchunhyang University Bucheon Hospital, Soonchunhyang University College of Medicine, Bucheon, Korea
5. Department of Pediatrics, Chungnam National University Hospital, Daejeon, Korea
6. Department of Pediatrics, Jeonbuk National University Hospital, Jeonbuk National University Medical School, Jeonju, Korea
7. Department of Pediatrics, Keimyung University Dongsan Hospital, Keimyung University School of Medicine, Daegu, Korea
8. Department of Pediatrics, Kosin University Gospel Hospital, Kosin University College of Medicine, Busan, Korea
9. Department of Pediatrics, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul, Korea
10. Department of Pediatrics, Korea University Anam Hospital, Seoul, Korea
11. Department of Pediatrics, Inje University Ilsan Paik Hospital, Goyang, Korea
12. Department of Pediatrics, Yonsei University Wonju College of Medicine, Wonju, Korea
13. Department of Pediatrics, Hallym University College of Medicine, Chuncheon, Korea
14. Departments of Pediatrics, Daegu Catholic University School of Medicine, Daegu, Korea
15. Departments of Preventive Medicine, Daegu Catholic University School of Medicine, Daegu, Korea
16. Departments of Medical Statistics, Daegu Catholic University School of Medicine, Daegu, Korea