1. Division of Endoscopy, Shizuoka Cancer Center, Sunto-gun, Shizuoka, Japan
2. Department of Surgery, School of Medicine, Keio University, Shinjuku-ku, Tokyo, Japan
3. Division of Pathology, Shizuoka Cancer Centre, Sunto-gun, Shizuoka, Japan
4. Experimental Animal Facility, Shizuoka Cancer Centre, Sunto-gun, Shizuoka, Japan
5. Cancer Diagnostics Research Division, Shizuoka Cancer Center Research Institute, Sunto-gun, Shizuoka, Japan
6. Regional Resources Division, Shizuoka Cancer Center Research Institute, Sunto-gun, Shizuoka, Japan
7. Shizuoka Cancer Center, Sunto-gun, Shizuoka, Japan