1. Department of Gastroenterology University of Ulsan College of Medicine, Asan Medical Center Seoul Korea
2. Department of Microbiology Hanyang University College of Medicine Seoul Korea
3. Department of Internal Medicine Hallym University College of Medicine Chuncheon Korea
4. Department of Internal Medicine, Incheon St. Mary's Hospital The Catholic University of Korea Incheon Korea
5. Department of Internal Medicine, Severance Hospital Yonsei University College of Medicine Seoul Korea
6. Department of Internal Medicine, College of Medicine Ewha Womans University Seoul Korea
7. Center for Gastric Cancer Research Institute and Hospital, National Cancer Center Goyang Korea
8. Department of Internal Medicine Seoul National University Bundang Hospital Seongnam Korea
9. Department of Internal Medicine Yeungnam University College of Medicine Daegu Korea
10. Department of Internal Medicine Inje University College of Medicine Busan Korea
11. Department of Internal Medicine Chonnam National University Medical School Gwangju Korea
12. Department of Internal Medicine Chungnam National University College of Medicine Daejeon Korea
13. Department of Internal Medicine, Gil Medical Center Gachon University Incheon Korea
14. Department of Internal Medicine, St. Mary’s Hospital, College of Medicine The Catholic University of Korea Seoul Korea
15. Department of Medicine, Samsung Medical Center Sungkyunkwan University School of Medicine Seoul Korea
16. Department of Internal Medicine, Ansan Hospital Korea University College of Medicine Ansan Korea