title: What is a normal upper gastrointestinal tract?
authors.forename: D G
authors.initials: DG
authors.lastname: Colin-Jones
authors.forename: P L
authors.initials: PL
authors.lastname: Golding
mesh_terms: D001706:Biopsy; D004064:Digestive System / Q000033:anatomy & histology / Q000473:pathology*; D004066:Digestive System Diseases / Q000175:diagnosis / Q000473:pathology*; D016145:Endoscopy, Digestive System; D006801:Humans