Sadaf, Sairah, Haq Dad Durrani, and Babar Bashir. “Effectiveness of Non-Invasive Vs. Invasive Ventilation in Acute Hypoxic Respiratory Failure in COVID-19 Patients in Critical Care: A Retrospective Cohort in Rahim Yar Khan, Pakistan”. Pakistan Journal of Medical Research 60, no. 2 (July 9, 2021): 90-95. Accessed October 1, 2022. https://pjmr.org.pk/index.php/pjmr/article/view/105.