title: [CONTRIBUTION TO THE STUDY OF OSTIUM PRIMUM].
mesh_terms: D006328:Cardiac Catheterization; D004562:Electrocardiography; D006343:Heart Septal Defects; D006344:Heart Septal Defects, Atrial; D006801:Humans; D013902:Radiography, Thoracic; D014672:Vectorcardiography
keywords: ELECTROCARDIOGRAPHY; HEART CATHETERIZATION; HEART SEPTAL DEFECTS, ATRIAL; THORACIC RADIOGRAPHY; VECTORCARDIOGRAPHY
vernacular_title: CONTRIBUTO ALLO STUDIO DELL'OSTIUM PRIMUM.