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The mean percentage change in oxidative stress parameters in the WBC group (gray) and the ET group (black). The concentration of a given parameter at the first collection was assumed as 100%. Statistically significant differences between the first and second measurement (pre- and post-procedure) are marked as * and # in the WBC and ET groups, respectively (LHP: lipid hydroperoxide; PON-1: paraoxonase-1; PSH: protein sulfhydryl; (e): erythrocyte lysates; (p): plasma; (s): serum).
