1. Department of Gastroenterology, Hallym University Sacred Heart Hospital, Anyang, Korea
2. Department of Internal Medicine, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Korea
3. Department of Gastroenterology, Samsung Medical Center, Seoul, Korea
4. Department of Internal Medicine, Seoul National University Hospital Healthcare System Gangnam Center, Seoul, Korea
5. Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
6. Department of Gastroenterology, Asan Medical Center, Seoul, Korea
7. National Evidence-based Healthcare Collaborating Agency, Seoul, Korea
8. Department of Gastroenterology, Chosun University Hospital, Gwangju, Korea
9. Department of Gastroenterology, Cha University Bundang Medical Center, Seongnam, Korea
10. Department of Gastroenterology, Jeonbuk National Hospital, Jeonju, Korea
11. Department of Gastroenterology, Daegu Catholic University School of Medicine, Daegu, Korea
12. Department of Gastroenterology, Korea University Anam Hospital, Seoul, Korea