title: Roentgen diagnosis of the upper gastrointestinal tract. Historical development.
mesh_terms: D041981:Gastrointestinal Tract / Q000000981:diagnostic imaging*; D011859:Radiography; D011871:Radiology / Q000266:history*; D041742:Upper Gastrointestinal Tract
keywords: GASTROINTESTINAL SYSTEM/radiography; RADIOLOGY/history