All experiments were performed in triplicate and all data were
expressed with mean standard deviations (SD). The correlation
coefficient (r2) between the parameters tested was established by
regression analysis. Statistical analyses were performed with
Graph Pad InStat. The observed differences were analysed for statistical
significance by one-way analysis of variance with Tukey’s
multiple comparison as a post hoc test. Differences of P < 0.05 were
considered as significant.