1. Division of Endoscopy, Shizuoka Cancer Center, Japan
2. Division of Genetic Medicine Promotion, Shizuoka Cancer Center, Japan
3. Department of Anatomic Pathology, Kurashiki Central Hospital, Japan
4. Department of Pathology, the Sol Goldman Pancreatic Cancer Research Center, Johns Hopkins Medical University, USA
5. Division of Hepato-Biliary-Pancreatic Surgery, Shizuoka Cancer Center, Japan