1. Department of Molecular Carcinogenesis Chiba Cancer Center Research Institute Chiba Japan
2. Department of Pathology, Graduate School of Medicine The University of Tokyo Tokyo Japan
3. Department of Gastroenterology Chiba Cancer Center Chiba Japan
4. Division of Oncogenomics Chiba Cancer Center Research Institute Chiba Japan
5. Division of Pathological Diagnosis Matsudo City General Hospital Chiba Japan
6. Department of Hepatobiliary‐Pancreatic Surgery Chiba Cancer Center Chiba Japan
7. Department of Pathology Asahi General Hospital Chiba Japan
8. Division of Surgical Pathology Chiba Cancer Center Chiba Japan
9. Department of Internal Medicine Funabashi Central Hospital Chiba Japan