Statistical Analysis
Statistical Package for Social Sciences (SPSS) for Windows v17.0.0 program was used for the statistical analysis of the data obtained from the patients participated to study. While assessing the obtained data, besides descriptive statistical methods (mean, standard deviation), Student t test was used for comparing normally distributed parameters between groups in comparison of quantitative data, and MannWhitneyU test was used for comparing non-normally distributed parameters between groups. Comparison of percentages between groups was performed through using the Chi-square test.