1. Department of Gastroenterology and Hepatology of Japan Community Health Care Organization Hokkaido Hospital
2. Department of Pathology of Japan Community Health Care Organization Hokkaido Hospital
3. Department of Gastroenterological Surgery I, Hokkaido University Graduate School of Medicine
4. Department of Organ Transplantation, Hokkaido University Graduate School of Medicine
5. Division of Organ Transplantation, Hokkaido University Hospital