Statistical analysis of the data
The data was fed to the computer and analyzed using IBM SPSS software package version 20.0. (Armonk, NY: IBM Corp). The Kolmogorov- Smirnov was used to verify the normality of the distribution of variables. Continuous data were presented in the form of mean and standard deviation (SD) if normally distributed and in the form of median and range if skewed. Categorical data were presented in the form of numbers and percentages. Comparisons between groups for categorical variables were assessed using the Chi-square test. Student t-test was used to compare two groups for normally distributed quantitative variables. The Mann–Whitney test was used to compare two groups for non-normally distributed quantitative variables. The significance of the obtained results was judged at the 5% level.