1. Gastroenterology and Metabology, Ehime University Graduate School of Medicine, Japan
2. Center for Liver-Biliary-Pancreatic Disease, Matsuyama Red Cross Hospital, Japan
3. Hepato-biliary-pancreatic Surgery and Transplantation, Ehime University Graduate School of Medicine, Japan
4. Department of Pathology, Matsuyama Red Cross Hospital, Japan
5. Pathology Division, Ehime University Hospital, Japan
6. Endoscopy Center, Ehime University Hospital, Japan