<qa>  How many patients were included in the study?The sample size calculation, made by G Power 3.0.10 statistical software package effect size effect size 0.4, α 0.05, degrees of freedom df 48 and 0.85 power power 1- β, the number of 50 patients were found to be adequate. However for practical magnification error with a sample of 10 of 55 patients were included in the study. 