1. Department of Gastroenterology, Hanyang University Guri Hospital, Guri, Korea
2. Department of Gastroenterology, Asan Medical Center, Seoul, Korea
3. Department of Gastroenterology, Inje University Ilsan Paik Hospital, Goyang, Korea
4. Department of Gastroenterology, Yonsei University Gangnam Severance Hospital, Seoul, Korea
5. Department of Gastroenterology, Inje University Busan Paik Hospital, Busan, Korea
6. Department of Gastroenterology, Samsung Medical Center, Seoul, Korea
7. Department of Gastroenterology, Yeungnam University Medical Center, Daegu, Korea
8. Department of Gastroenterology, Seoul National University Hospital Healthcare System Gangnam Center, Seoul, Korea
9. Department of Gastroenterology, Seoul National University Hospital, Seoul, Korea
10. Department of Gastroenterology, Yonsei University Severance Hospital, Seoul, Korea
11. Department of Gastroenterology, Kyung Hee University Hospital at Gangdong, Seoul, Korea
12. Center for Colorectal Cancer, National Cancer Center, Goyang, Korea
13. Department of Pathology, Seoul National University Bundang Hospital, Seongnam, Korea
14. National Evidence-based Healthcare Collaborating Agency, Seoul, Korea
15. Center for Gastric Cancer, National Cancer Center, Goyang, Korea
16. Department of Gastroenterology, Chosun University Hospital, Gwangju, Korea
17. Department of Gastroenterology, Cha University Bundang Medical Center, Seongnam, Korea
18. Department of Gastroenterology, Jeonbuk National University Hospital, Jeonju, Korea
19. Department of Gastroenterology, Korea University Anam Hospital, Seoul, Korea