1. Department of Gastroenterology and Endoscopy National Cancer Center Hospital East Kashiwa Japan
2. Department of Gastroenterology Kitasato University School of Medicine Sagamihara Japan
3. Department of Gastroenterology Ichinomiyanishi Hospital Ichinomiya Japan
4. Department of Head and Neck Surgery National Cancer Center Hospital East Kashiwa Japan
5. Division of Pathology, Exploratory Oncology Research and Clinical Trial Center National Cancer Center Kashiwa Japan
6. Department of Molecular Pathology Yokohama City University Graduate School of Medicine Yokohama Japan
7. Department of Endoscopy Saitama Cancer Center Kitaadachi Japan