1. Institute for Digestive Research, Digestive Disease Center, Soonchunhyang University College of Medicine, Seoul, Korea
2. Department of Rheumatology, Soonchunhyang University College of Medicine, Seoul, Korea
3. Department of Internal Medicine, Soonchunhyang University College of Medicine, Bucheon, Gyeonggi-do, Korea
4. Division of Gastroenterology, Cheonan Hospital, Soonchunhyang University College of Medicine, Cheonan, Chungcheongnam-do, Korea