Yılmazer MM, Güven B, Vupa-Çilengiroğlu Ö, et al. Improvement in cardiac structure and functions early after transcatheter closure of secundum atrial septal defect in children and adolescents. Turk J Pediatr 2013; 55: 401-410. https://doi.org/10.24953/turkjpediatr.2013.1522