Dilshad, Muhammad Akif, Shahid Sarwar, Farheen Aslam, Adnan Shabbir, Shafqat Rasool, and Ghias un-Nabi Tayyab. “Risk of Covid-19 Infection During endoscopy: Efficacy of Personal Protective Equipment (PPE) in Protecting Health Professionals”. Pakistan Journal of Medical Sciences 37, no. 4 (May 6, 2021). Accessed April 26, 2024. https://www.pjms.org.pk/index.php/pjms/article/view/4057.