1. Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, Korea
2. National Evidence-Based Healthcare Collaborating Agency, Seoul, Korea
3. National Health Insurance Service, Seoul, Korea
4. Center for Gastric Cancer, National Cancer Center, Goyang, Korea
5. Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Korea
6. Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea
7. Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
8. Department of Internal Medicine, Inje University Busan Paik Hospital, Busan, Korea
9. Department of Internal Medicine, The Catholic University of Korea College of Medicine, Seoul, Korea
10. Digestive Disease Center, Soonchunhyang University Hospital, Seoul, Korea
11. Digestive Disease Center, CHA Bundang Medical Center, CHA University, Seongnam, Korea
12. Department of Internal Medicine, Pusan National University School of Medicine, Busan, Korea
13. Department of Internal Medicine, Institute of Digestive Diseases and Nutrition, Korea University College of Medicine, Seoul, Korea
14. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
15. Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea