Saeed, Sahrai, and Ronak Rajani. “The Association of Pre-Existing Comorbid Conditions With COVID-19 Severity and Post-COVID Complications; Insights from South Asia: Pre-Existing Comorbid Conditions and COVID-19”. Pakistan Journal of Medical Sciences 38, no. 3 (January 14, 2022). Accessed January 24, 2022. https://pjms.org.pk/index.php/pjms/article/view/5719.