Statistical analysis
Data were analyzed using IBM SPSS Statistics for Windows, version 20 (IBM Corp., Armonk, N.Y., USA). Data were reported by frequency, percent, mean, and standard deviation. Qualitative variables were also described based on number and percent. At first, the normality of the data was evaluated using the Kolmogorov-Smirnov test. Then, independent T and chi-square tests were used to compare the groups in terms of different variables. It is noteworthy that in case of non-normal data, Mann-Whitney U test and if data did not fulfill the necessary condition for chi-square, Fisher’s exact test was used. We used the Friedman test to compare the quantitative non-normal data. P-value less than 0.05 was considered significant. The investigation was performed based on the intention to treat analysis.