Altaf, Abeer, Zaigham Abbas, Muhammad Ali Qadeer, and Mehreen Siyal. “Point of Care Testing for SARS-COV-2 Antibodies before doing Endoscopy”. Pakistan Journal of Medical Sciences 39, no. 2 (February 15, 2023). Accessed May 3, 2024. https://www.pjms.org.pk/index.php/pjms/article/view/5659.