Rizvi, Syed Faiz-ul- Hassan, et al. “PREVALENCE OF CONGENITAL HEART DISEASE IN RURAL COMMUNITIES OF PAKISTAN”. Journal of Ayub Medical College Abbottabad, vol. 27, no. 1, Mar. 2015, pp. 124-7, https://jamc.ayubmed.edu.pk/index.php/jamc/article/view/1084.