The experimental data collected from repeated experiments or multiple animals are presented as the means (standard deviation). The comparisons between different groups were performed by a 2-sided t test using the statistical software SPSS 19.0. For the survival analysis, Kaplan-Meier survival curves were constructed. A Cox proportional hazards model was used, and the hazard ratios between groups were tested by a Wald χ2 test. Differences were considered to be significant at P <.05.
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