Alam, U. K., S. Kadri, N. Ahmed, M. A. Memon, and T. Mehmood. “Chest X-Ray (First Tool of Imaging) in COVID-19 Patients Radiological and Clinical Correlation - A Tertiary Care Experience at Jinnah Postgraduate Medical Centre, Karachi”. Pakistan Journal of Medical Research, Vol. 60, no. 3, Oct. 2021, pp. 104-10, https://pjmr.org.pk/index.php/pjmr/article/view/140.