1. Division of Hepatobiliary and Pancreatic Disease; Department of Internal Medicine; Hyogo College of Medicine; Nishinomiya Japan
2. Department of Surgery; Hyogo College of Medicine; Nishinomiya Japan
3. Department of Radiology; Hyogo College of Medicine; Nishinomiya Japan
4. Department of Gastroenterology and Hepatology; Faculty of Medicine; Kinki University; Sayama Japan
5. Department of Hepato-Biliary-Pancreatic Surgery; Tokyo Medical and Dental University; Tokyo Japan