title: Endoscopic difficulties in the diagnosis of upper gastrointestinal bleeding.
authors.affiliation: Department of Gastroenterology, Barts and The London NHS Trust, London E1 1BB, UK.
authors.forename: M N
authors.initials: MN
authors.lastname: Appleyard
authors.forename: C P
authors.initials: CP
authors.lastname: Swain
mesh_terms: D016888:Angiodysplasia / Q000175:diagnosis*; D016099:Endoscopy, Gastrointestinal / Q000379:methods*; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis*; D006801:Humans