1. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
2. Department of Internal Medicine, St. Vincent’s Hospital, College of Medicine, The Catholic University of Korea, Suwon, Korea
3. Division of Gastroenterology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
4. Department of Gastroenterology and Inflammatory Bowel Disease Center, University of Ulsan College of Medicine, Seoul, Korea
5. Department of Internal Medicine, Hanyang University Guri Hospital, Guri, Korea
6. Medical Science Division, Celltrion, Inc., Incheon, Korea
7. Department of Internal Medicine I, University Hospital Schleswig-Holstein, Kiel University, Kiel, Germany