Tahir, M., B. Irfan, O. . Irfan, K. Nanji, and W. Qidwai. “ Pakistan”. Journal of the Dow University of Health Sciences (JDUHS), vol. 11, no. 3, Dec. 2017, pp. 93-96, https://mail.jduhs.com/index.php/jduhs/article/view/1364.