Wajeeha Qayyum, et al. “CORONA VIRUS DISEASE-19 CLINICAL AND LABORATORY CHARACTERISTICS ASSOCIATED WITH DISEASE SEVERITY IN PATIENTS PRESENTING AT A TERTIARY CARE HOSPITAL OF PESHAWAR”. Journal of Ayub Medical College Abbottabad, vol. 33, no. 3, July 2021, pp. 507-12, https://jamc.ayubmed.edu.pk/index.php/jamc/article/view/9355.