1. Department of Gastroenterology and Hepatology, Kansai Medical University
2. Department of Pathology, Kansai Medical University
3. Department of Surgery, Kansai Medical University
4. Department of Gastroenterology, Aichi Cancer Center Hospital
5. Department of Pathology, Kurashiki Central Hospital
6. Department of Gastroenterology, Tohoku University Graduate School of Medicine
7. Department of Pathology, University of Verona
8. Department of Medicine, Pancreas Center, University of Verona