1. Department of Internal Medicine, Chung-Ang University College of Medicine, Seoul, Korea
2. Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
3. Department of Internal Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
4. Department of Internal Medicine, School of Medicine, Kyungpook National University, Daegu, Korea
5. Department of Internal Medicine, Pusan National University School of Medicine, Busan, Korea
6. Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Korea
7. Department of Internal Medicine, Chungnam National University College of Medicine, Daejeon, Korea
8. Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seoul, Korea
9. Department of Internal Medicine, Jeju National University School of Medicine, Jeju, Korea
10. Department of Internal Medicine, Kosin University Gospel Hospital, Kosin University College of Medicine, Busan, Korea
11. Center for Gastric Cancer, National Cancer Center, Goyang, Korea
12. Department of Internal Medicine, Chungbuk National University Hospital, Chungbuk National University College of Medicine, Cheongju, Korea
13. Department of Internal Medicine, Chonbuk National University Hospital, Chonbuk National University Medical School, Jeonju, Korea
14. Department of Internal Medicine, Hallym University College of Medicine, Chuncheon, Korea
15. Department of Internal Medicine, Dongsan Medical Center, Keimyung University School of Medicine, Daegu, Korea
16. Department of Internal Medicine, Yeouido St. Mary Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
17. Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, Korea
18. Medical Research Collaborating Center, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
19. Department of Prevention and Management, Inha University Hospital, Inha University School of Medicine, Incheon, Korea