1. Department of Gastroenterology Ulsan University College of Medicine, Gangneung Asan Hospital Gangneung South Korea
2. Department of Gastroenterology Konyang University Hospital Daejeon South Korea
3. Department of Gastroenterology, College of Medicine Catholic University of Daegu Daegu South Korea
4. Department of Gastroenterology Ulsan University College of Medicine, Asan Medical Center Seoul South Korea
5. Department of Gastroenterology, College of Medicine Eunpyeong St. Mary's Hospital, Catholic University of Korea Seoul South Korea
6. Department of Gastroenterology, College of Medicine Kosin University Pusan South Korea
7. Department of Gastroenterology, College of Medicine Dankook University Cheonan South Korea
8. Department of Gastroenterology, College of Medicine Keimyung University Daegu South Korea
9. Department of Gastroenterology, College of Medicine Ewha Woman's University Seoul South Korea
10. Department of Gastroenterology Seoul National University, Bundang Seoul University Hospital Seongnam South Korea
11. Department of Gastroenterology Inje University Ilsan Paik Hospital Goyang South Korea
12. Department of Gastroenterology, Samsung Medical Center, School of Medicine Sungkyunkwan University Seoul South Korea