title: Quantitation of shunt flow in atrial septal defects by contrast echocardiography.
authors.forename: A
authors.initials: A
authors.lastname: Vitarelli
mesh_terms: D004452:Echocardiography / Q000379:methods; D006344:Heart Septal Defects, Atrial / Q000000981:diagnostic imaging* / Q000503:physiopathology; D006801:Humans