Data analysis was performed using the statistical software SPSS 17.0 (SPSS Inc., USA) and Origin 8.0 software programs (Origin Lab, Northampton, MA, USA). Data were expressed as the means ± standard error (SE). Data were statistically analysed using one-way analysis, followed by Student’s t-test (comparing two groups) or LSD post-hoc test (comparing more than two groups). p < 0.05 was considered statistically significant.
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