title: Perception and interpretation: the problem of the visible vessel.
authors.forename: P
authors.initials: P
authors.lastname: Swain
mesh_terms: D001808:Blood Vessels / Q000473:pathology; D003118:Color Perception; D004386:Duodenum / Q000098:blood supply; D016099:Endoscopy, Gastrointestinal; D006801:Humans; D015588:Observer Variation; D010438:Peptic Ulcer Hemorrhage / Q000175:diagnosis* / Q000473:pathology; D013270:Stomach / Q000098:blood supply; D014796:Visual Perception