“Evaluation of Regional Left and Right Ventricular Function in Patients with Ostium-Secundum Atrial Septal Defect Using Speckle Tracking Echocardiography”, acbr, vol. 4, no. 4, pp. 274–291, Jul. 2020, Accessed: Sep. 17, 2026. Available: https://fortunejournals.org/ojs/index.php/acbr/article/view/14770