1. Department of Radiation Oncology Faculty of Medicine Hokkaido University Sapporo Hokkaido Japan
2. Department of Diagnostic and Interventional Radiology Hokkaido University Hospital Sapporo Hokkaido Japan
3. Department of Radiation Oncology Hokkaido University Hospital Sapporo Hokkaido Japan
4. Department of Radiation Medical Science and Engineering Faculty of Medicine Hokkaido University Sapporo Hokkaido Japan
5. Department of Diagnostic Imaging Faculty of Medicine Hokkaido University Sapporo Hokkaido Japan
6. Department of Medical Physics Hokkaido University Hospital Sapporo Hokkaido Japan
7. Department of Gastroenterology and Hepatology Faculty of Medicine Hokkaido University Sapporo Hokkaido Japan
8. Department of Gastroenterological Surgery I Faculty of Medicine Hokkaido University Sapporo Hokkaido Japan