1. Division of Endoscopy, Shizuoka Cancer Center, Shizuoka, Japan
2. Division of Genetic Medicine Promotion, Shizuoka Cancer Center, Shizuoka, Japan
3. Division of Pathology, Shizuoka Cancer Center, Shizuoka, Japan
4. Division of Hepato-Biliary-Pancreatic Surgery, Shizuoka Cancer Center, Shizuoka, Japan