1. Division of Gastroenterology, Department of Internal MedicineKobe University Graduate School of Medicine Kobe Hyogo Japan
2. Division of Hepato‐Biliary‐Pancreatic Surgery, Department of SurgeryKobe University Graduate School of Medicine Kobe Hyogo Japan
3. Department of RadiologyKobe University Graduate School of Medicine Kobe Hyogo Japan
4. Center for Clinical Research and Advanced Medicine EstablishmentShiga University of Medical Science Ōtsu Shiga Japan
5. Division of Diagnostic PathologyKobe University Graduate School of Medicine Kobe Hyogo Japan