Statistical analysis
The data were examined with the software package IBM SPSS Statistics Version 22. The normal distribution of the data was examined with the Shapiro Wilk test. An independent t test was used for the discrepancy among groups for variables with normal distribution, and a Mann Whitley U test was used for the discrepancy among groups for variables that did not show a normal distribution. A chi-squared analysis was implemented to study the relationship between the groups for the nominal variables. In the intragroup comparison, Friedman's two-way ANOVA was used for at least two dependent variables that did not show a normal distribution in their analyses. Variables that differed were examined using pairwise comparison tests if significant differences emerged. Statistical significance was set at 