title: A 77-year-old man with nonvariceal upper gastrointestinal bleeding.
authors.forename: Kyle J
authors.initials: KJ
authors.lastname: Fortinsky
authors.forename: Nathan M
authors.initials: NM
authors.lastname: Stall
authors.forename: Alan N
authors.initials: AN
authors.lastname: Barkun
mesh_terms: D000368:Aged; D003937:Diagnosis, Differential; D004381:Duodenal Ulcer / Q000150:complications* / Q000175:diagnosis; D004636:Emergency Service, Hospital; D016099:Endoscopy, Gastrointestinal; D017707:Erythrocyte Transfusion; D006471:Gastrointestinal Hemorrhage / Q000209:etiology* / Q000628:therapy; D006801:Humans; D008297:Male