1. Department of Internal Medicine, Presbyterian Medical Center, Jeonju, Korea.
2. Department of Internal Medicine, Digestive Disease Research Institute, Wonkwang University School of Medicine, Iksan, Korea.
3. Division of Gastroenterology, Department of Internal Medicine, Kyung Hee University School of Medicine, Seoul, Korea.
4. Division of Gastroenterology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
5. Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
6. Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
7. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
8. Department of Internal Medicine, Chungnam National University School of Medicine, Daejeon, Korea.
9. Department of Internal Medicine, Kyungpook National University School of Medicine, Daegu, Korea.
10. Center for Gastric Cancer, National Cancer Center, Goyang, Korea.
11. Department of Internal Medicine, Pusan National University School of Medicine, Busan, Korea.
12. Department of Internal Medicine, Inje University Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
13. Division of Gastroenterology, Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Korea.