1. Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, Korea.
2. Department of Internal Medicine, Catholic University of Daegu School of Medicine, Daegu, Korea.
3. Department of Gastroenterology, Gachon University Gil Medical Center, Gachon University College of Medicine, Incheon, Korea.
4. Center for Gastric Cancer, National Cancer Center, Goyang, Korea.
5. Digestive Disease Center, CHA Bundang Medical Center, CHA University, Seongnam, Korea.