Statistical Analysis
All analyses were performed using Statistical Packages for Social Sciences for Windows, Version 20.0 (SPSS Inc., NY, USA). The data were expressed as means with standard deviations. Comparisons of the groups for normally distributed variables were performed using an independent samples t test. Differences between groups without normal distribution were checked with Mann-Whitney U test, while groups with categorical variables were compared with Pearson chi-square test. Significance was evaluated at p value <0.05 for all tests.