Uysal, Dincer, and Mevlut Serdar Kuyumcu. “Effects of Surgical Atrial Septal Defect Closure Operation on the Frontal QRS-T Angle”. Annals of Medical Research 28, no. 5 (May 25, 2021): 1029–1033. Accessed May 5, 2024. http://www.annalsmedres.org/index.php/aomr/article/view/494.