Ahmed, S., Z. Ali, M. Y. Noori, and S. Sharafat. “Presentation Stage in Smear Positive Patients of Tuberculosis in Karachi, Pakistan: A Gender Based Comparison”. Pakistan Journal of Chest Medicine, vol. 23, no. 2, June 2018, pp. 53-56, https://pjcm.net/index.php/pjcm/article/view/452.