title: [4th World Congress of Digestive Endoscopy, Madrid, June 1--3, 1978].
mesh_terms: D003226:Congresses as Topic; D004064:Digestive System; D004724:Endoscopy; D013030:Spain
vernacular_title: IV. Svĕtový kongres trávicí endoskopie, Madrid 1.-3. cervna 1978.