1. Division of Gastroenterological Surgery Chiba Cancer Center Chiba Japan
2. Department of Diagnostic Radiology and Radiation Oncology Graduate School of Medicine Chiba University Chiba Japan
3. Division of Hepato‐Biliary‐Pancreatic Surgery Chiba Cancer Center Chiba Japan
4. Faculty of Engineering Graduate School of Engineering Chiba University Chiba Japan
5. Division of Clinical Pathology Chiba Cancer Center Chiba Japan
6. Laboratory of Cancer Genetics Chiba Cancer Center Research InstituteChiba Cancer Center Chiba Japan