Statistical data analysis.
Data are presented as median with interquartile ranges. The
non-parametric Mann-Whitney test was used to compare unpaired values
(GraphPad PrismĀ®). Values of p<0.05 were considered
significant. The level of significance is indicated with asterisks: *,
p<0.05; **, p<0.01; ***, p<0.001; ****,
p<0.0001 and n.s., non-significant.