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Vitamin A plasma levels in patients with moderate, severe, and critical disease, and in convalescent patients; the Wilcoxon rank test showed significant differences (p < 0.001). Subgroups were tested for differences in the Bonferroni correction (* p < 0.05, ** p < 0.01, *** p < 0.001). Mann–Whitney U test was used to compare groups (* p < 0.05, ** p < 0.01, *** p < 0.001).
