1. Department of Pediatrics, School of Medicine, Kyungpook National University, Daegu, South Korea
2. Crohn’s and Colitis Association in Daegu-Gyeongbuk [CCAiD], Daegu, South Korea
3. Department of Pediatrics, Inje University College of Medicine, Busan, South Korea
4. Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
5. Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
6. Statistics and Data Center, Research Institute for Future Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
7. Department of Pediatrics, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, South Korea