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Comparison of trace minerals and vitamin C biomarkers among HCs and groups of COVID-19 patients. Kruskal–Wallis test was used for the comparison of (a) Zinc; (b) Copper and (c) Vitamin C. Dunn’s test was applied as a post-hoc test for multiple comparisons. *p-value < 0.05, ** p-value < 0.01, and **** p-value < 0.0001.
Abbreviations: HCs, healthy controls; NS, non-significant.
