1. Division of Endoscopy, Shizuoka Cancer Center, Nagaizumi, Suntogun, Shizuoka, Japan
2. Division of Pathology, Shizuoka Cancer Center, Nagaizumi, Suntogun, Shizuoka, Japan
3. Division of Diagnostic Radiology, Shizuoka Cancer Center, Nagaizumi, Suntogun, Shizuoka, Japan