title: Comments on the classification.
authors.affiliation: Japan Gastroenterological Society (JGES), Tokyo, Japan.
authors.forename: Hirohumi
authors.initials: H
authors.lastname: Niwa
mesh_terms: D004067:Digestive System Neoplasms / Q000145:classification / Q000473:pathology*; D019723:Endoscopes / Q000145:classification; D016145:Endoscopy, Digestive System / Q000145:classification*; D006801:Humans; D009367:Neoplasm Staging; D012680:Sensitivity and Specificity