1. Division of Gastroenterology, Department of Internal Medicine Kobe University Graduate School of Medicine Kobe Japan
2. Department of Gastroenterology and Hepatology Kindai University Faculty of Medicine Osaka‐Sayama Japan
3. Division of Hepato‐Biliary‐Pancreatic Surgery, Department of Surgery Kobe University Graduate School of Medicine Kobe Japan
4. Department of Radiology Kobe University Graduate School of Medicine Kobe Japan
5. Department of Internal Medicine, Division of Gastroenterology and Hepatology Hyogo College of Medicine Nishinomiya Japan
6. Department of Diagnostic Pathology Kobe University Graduate School of Medicine Kobe Japan