Statistical analysis was performed using the GraphPad Prism version 7.0 (GraphPad Software Inc., USA). Values were expressed as the mean ± standard deviation (SD). Two groups of the data were compared using the two-tailed Student's t test. Data from more than two groups were compared using one-way analysis of variance (ANOVA) followed by Turkey's post-test. P values were adjusted for multiple comparisons when appropriate. P < 0.05 was considered to indicate statistical significance.
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