Sadiq, Nadeem, Maad Ullah, Mehboob Sultan, Khurram Akhtar, and Hajira Akbar. 2014. “TRANSCATHETER DEVICE CLOSURE OF SECUNDUM ATRIAL SEPTAL DEFECT (ASD) IN YOUNG CHILDREN: Atrial Septal Defect (ASD)”. Pakistan Armed Forces Medical Journal 64 (2): 355-59. https://pafmj.org/PAFMJ/article/view/878.