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