1. Center for Crohn's and Colitis, Department of GastroenterologyKyung Hee University College of Medicine Seoul South Korea
2. Department of BiostatisticsYonsei University Wonju College of Medicine Wonju Republic of Korea
3. Department of Internal MedicineYonsei University Wonju College of Medicine Wonju Republic of Korea
4. Department of Internal MedicineChungbuk National University Hospital, Chungbuk National University College of Medicine Cheongju South Korea
5. Department of Internal Medicine, College of MedicineDaejeon St. Mary's Hospital, The Catholic University of Korea Daejeon South Korea
6. Department of Internal Medicine, School of MedicineKyungpook National University Daegu South Korea
7. Department of Internal MedicineHaeundae Paik Hospital, Inje University College of Medicine Busan South Korea
8. Department of Internal MedicineJeju National University School of Medicine Jeju South Korea
9. Department of Internal MedicineChosun University College of Medicine Gwangju South Korea
10. Department of Internal MedicineChonbuk National University Medical School Jeonju South Korea
11. Department of Internal MedicineKonyang University College of Medicine Daejeon South Korea
12. Department of Internal MedicineNational Health Insurance Service Ilsan Hospital Goyang South Korea
13. Department of Internal Medicine, College of MedicineThe Catholic University of Korea Seoul South Korea
14. Department of Internal MedicineKorea University College of Medicine Seoul South Korea
15. Department of Internal MedicineYonsei University College of Medicine Seoul South Korea
16. Department of Internal MedicineKyung Hee University Hospital at Gang Dong, Kyung Hee University College of Medicine Seoul South Korea
17. Department of Gastroenterology and Inflammatory Bowel Disease CenterAsan Medical Center, University of Ulsan College of Medicine Seoul South Korea
18. Department of Internal MedicineChung‐Ang University College of Medicine Seoul South Korea