Statistical analysis
All analyses were performed on SPSS v21 (SPSS Inc., Chicago, IL, USA). For the normality check, the Kolmogorov-Smirnov test was used. Data are given as mean ± standard deviation or median (1st quartile - 3rd quartile) for continuous variables according to normality of distribution, and as frequency (percentage) for categorical variables. Repeated measurements were analyzed with the Friedman’s analysis of variances by ranks since parametric test assumptions were not met. Post-hoc pairwise comparisons were performed with the Bonferroni correction method. Multiple linear regression analysis (stepwise selection method) was performed to determine significant factors associated with outcomes. p<0.05 values were accepted as statistically significant results.