2.13. Statistical analysis
All data were expressed as mean ± standard deviation (SD) of at least
three independent experiments. Statistical analyses were performed using
GraphPad Prism 6 software (GraphPad Software Inc., La Jolla, CA, USA).
Differences among more than two groups were analyzed by one-way ANOVA
followed by a Tukey HSD comparison test. Values of P < 0.05
were considered statistically significant.