1. Department of Pediatrics, Daegu Catholic University School of Medicine, Daegu, Korea.
2. Crohn's and Colitis Association in Daegu-Gyeongbuk (CCAiD), Daegu, Korea.
3. Department of Pediatrics, Dongguk University School of Medicine, Gyeongju, Korea.
4. Department of Pediatrics, School of Medicine, Kyungpook National University, Daegu, Korea.
5. Department of Pediatrics, Keimyung University School of Medicine, Daegu, Korea.
6. Department of Pediatrics, Yeungnam University School of Medicine, Daegu, Korea.
7. Department of Preventive Medicine, Daegu Catholic University School of Medicine, Daegu, Korea.