1. Hepato‐Biliary‐Pancreatic Surgery and Artificial Organ and Transplantation Divisions, Department of SurgeryThe Tokyo University HospitalTokyo Japan
2. Department of Biostatistics, School of Public HealthThe University of TokyoTokyo Japan
3. Department of PathologyKeio University School of MedicineTokyo Japan
4. Department of GastroenterologyMusashino Red Cross HospitalTokyo Japan
5. Department of RadiologyShinshu University School of MedicineMatsumoto Japan
6. Department of GastroenterologyKanazawa University HospitalKanazawa Japan
7. Division of Hepato‐Biliary‐Pancreatic Surgery, Department of SurgeryKobe University Graduate School of MedicineKobe Japan
8. Department of Gastroenterology and HepatologyKinki University School of MedicineOsaka Japan
9. Department of Digestive SurgeryNihon University School of MedicineTokyo Japan
10. Department of Clinical Laboratory MedicineKurume University HospitalKurume Japan