title: Images in clinical medicine. Ostium secundum atrial septal defect.
authors.affiliation: University of Chicago, IL 60637, USA.
authors.forename: R M
authors.initials: RM
authors.lastname: Lang
authors.forename: R H
authors.initials: RH
authors.lastname: Marcus
mesh_terms: D000328:Adult; D017548:Echocardiography, Transesophageal; D006344:Heart Septal Defects, Atrial / Q000000981:diagnostic imaging*; D006801:Humans