Statistical analysis
Statistical evaluation was conducted with the IBM SPSS 15 package program (SPSS Inc., Chicago, IL, USA). Numerical variables with normal distribution are given as mean +/- standard deviation, numerical variables without normal distribution are given as median (minimum-maximum), and categorical variables as frequency (percentages). In the case of two groups, the difference between the groups was determined with the Student t Test for the numerical variables with normal distribution, the Mann Whitney U Test for the numerical variables without normal distribution, the Pearson Chi-Square Test and the Fischer Exact Test. The relationship between numerical variables was determined with the Pearson correlation analysis. P value of 0.05 was considered statistically significant.