1.
Ifra Eeman Ahmed, Azhar Ali, Abdullah Humayun. Association of Pre-Infection Vitamin D status with COVID-19 severity. J Pak Med Assoc [Internet]. 2023 Jul. 15 [cited 2024 Feb. 22];73(8):1770-. Available from: https://ojs.jpma.org.pk/index.php/public_html/article/view/8244