1. Department of Pediatrics, School of Medicine, Kyungpook National University, Daegu, Korea.
2. Crohn's and Colitis Association in Daegu-Gyeongbuk (CCAiD), Daegu, Korea.
3. Department of Emergency Medicine, School of Medicine, Kyungpook National University, Daegu, Korea.
4. Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
5. Department of Pediatrics, Severance Children's Hospital, Yonsei University College of Medicine, Seoul, Korea.
6. Department of Pediatrics, Soonchunhyang University Bucheon Hospital, Soonchunhyang University College of Medicine, Bucheon, Korea.
7. Department of Pediatrics, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea.
8. Department of Pediatrics, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea.
9. Department of Pediatrics, Chungbuk National University College of Medicine, Cheongju, Korea.
10. Department of Pediatrics, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Korea.
11. Department of Pediatrics, Keimyung University School of Medicine, Daegu, Korea.
12. Department of Pediatrics, Inje University Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Korea.
13. Department of Pediatrics, Inje University Haeundae Paik Hospital, Inje University College of Medicine, Busan, Korea.
14. Department of Pediatrics, Eulji University School of Medicine, Daejeon, Korea.