2.3 Statistical analysis
All measurements were carried out in triplicate, and results were expressed as means ± standard deviations (SD). The data were statistically analyzed by one-way ANOVA. Mean values between different samples were compared by Turkey’s multiple tests, and significant differences were established at p < 0.05. Correlation analysis was performed by Pearson’s test. Hierarchical cluster analysis (HCA) was used for classifying the samples. Statistical analyses were carried out with SPSS version 22.0 (IBM Corporation, New York, USA).