SPSS version 13.0 (SPSS Inc., Chicago, IL, USA) for Windows was used for all analyses. The data values were expressed as mean ± standard deviation. Differences between the groups were statistically evaluated by one-way analysis of variance (ANOVA) with the Student–Newman–Keuls test; two-way repeated measures ANOVA was applied for multiple comparisons, and Student’s t-test was applied for comparisons between two groups. Statistical significance was set at P<0.05. All reported P-values were two sided.
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