1. Department of Gastroenterology and Endoscopy National Cancer Center Hospital East Kashiwa Chiba Japan
2. Course of Advanced Clinical Research of Cancer Juntendo University Graduate School of Medicine Bunkyo‐ku Tokyo Japan
3. Medical Device Innovation Center National Cancer Center Hospital East Kashiwa Chiba Japan
4. Division of Science and Technology for Endoscopy, Exploratory Oncology Research & Clinical Trial Center National Cancer Center East Kashiwa Chiba Japan
5. Department of Medical Information National Cancer Center Hospital East Kashiwa Chiba Japan
6. Department of Head and Neck Surgery National Cancer Center Hospital East Kashiwa Chiba Japan
7. Division of Pathology, Exploratory Oncology Research & Clinical Trial Center National Cancer Center East Kashiwa Chiba Japan