1. Division of Cancer Stem Cell Miyagi Cancer Center Research Institute Natori Japan
2. Division of Cancer Stem Cell Tohoku University Graduate School of Medicine Sendai Japan
3. Division of Gastroenterology Tohoku Medical and Pharmaceutical University Hospital Sendai Japan
4. Department of Gastroenterology Miyagi Cancer Center Natori Japan
5. Division of Pathology Tohoku Medical and Pharmaceutical University Hospital Sendai Japan
6. Division of Molecular and Cellular Oncology Miyagi Cancer Center Research Institute Natori Japan
7. Gastroenterologic and Hepato‐Biliary‐Pancreatic Surgery Tohoku Medical and Pharmaceutical University Hospital Sendai Japan