Statistical analysis
Descriptive statistics were used to describe the study population. All parameters were described as mean and standard deviation (StDev). The Kolmogorov–Smirnov test was applied to express normality, while Spearman’s Correlation Coefficients were used to assess possible correlations between the above parameters. The level of significance was set to p < 0.05. Statistical analysis was performed using SPSS for Windows version 20.0 (SPSS Statistics 20, IBM Hellas Inc.).