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Violin plots of absolute GSH levels in serum of all COPD patient groups (A) and delta (post-pre) of serum GSH levels in placebo and iron-treated groups (B). The dashed line represents the median and the dotted lines the interquartile ranges. Statistical significance: n.s., no significance; * p < 0.05 between post-iron and pre-iron treatment. Definition of abbreviations: GSH, reduced glutathione.
