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Lakho, M. A.; Haroon, M.; Rehman Orakzai, S. U.; Shuaib, M.; Anjum, J.; Qamber, J. H. . 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 2022, 28, 498-502.