1. Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea
2. Department of Internal Medicine, Keimyung University School of Medicine, Daegu, Korea
3. Department of Internal Medicine, Presbyterian Medical Center, Jeonju, Korea
4. Department of Internal Medicine, Kyung Hee University Medical Center, Seoul, Korea
5. Department of Gastroenterology, Ajou University School of Medicine, Suwon, Korea
6. Center for Gastric Cancer, National Cancer Center, Goyang, Korea
7. Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea
8. Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
9. Department of Gastroenterology, Korea University College of Medicine, Seoul, Korea
10. Department of Pediatric Gastroenterology, CHA Bundang Medical Center, CHA University, Seongnam, Korea
11. Department of Internal Medicine, School of Medicine, Kyungpook National University, Daegu, Korea