[1]
M. A. Lakho, M. Haroon, S. U. Rehman Orakzai, M. Shuaib, J. Anjum, and J. H. . Qamber, “Correlation between Baseline Serum Levels of Vitamin A and Vitamin C and the Severity of COVID-19: A Retrospective Cohort Analysis”, Pak J Chest Med, vol. 28, no. 4, pp. 498–502, Dec. 2022.