title: [4th World Congress on Gastrointestinal Endoscopy (June, 1978, Madrid)].
mesh_terms: D003226:Congresses as Topic; D004724:Endoscopy; D006801:Humans; D013030:Spain
vernacular_title: IV Vsemirnyĭ kongress po gastrointestinal'noi endoskopii (Madrid, iiun' 1978 g.).