1. Department of Gastroenterology and Hepatology; Hokkaido University Graduate School of Medicine; Sapporo Japan
2. Division of Endoscopy; Hokkaido University Hospital; Sapporo Japan
3. Department of Surgical Pathology; Hokkaido University Hospital; Sapporo Japan
4. Laboratory of Chemical Biology and Molecular Imaging, Graduate School of Medicine; The University of Tokyo; Tokyo Japan
5. Department of Otolaryngology - Head and Neck Surgery; Hokkaido University Graduate School of Medicine; Sapporo Japan
6. Japan Agency for Medical Research and Development (AMED)-CREST; Tokyo Japan