Statistical analysis:
In this study, all information obtained was entered in to statistical package for the social sciences, version 25.0, SPSS Inc, Chicago, Illinois, USA (SPSS). Descriptive statistics were used to calculate the frequency (n), percentage (%), central tendency (mean, median&mode) and dispersion (range, variance, SD, maximum& minimum) for each variable when appropriate. The consistency of the data with the normal dispersion has been evaluated by the Kolmogorov-Smirnov test. Student-t test, Mann Whitney- U test, One-way ANOVA test or Chi square test were used when appropriate.