Statistical Analysis
All analyses were performed with SPSS 25.0 (IBM Corporation, Armonk, NY,
USA). Gaussian distribution of continuous variables were confirmed by
Shapiro-Wilk test and values were presented as mean with standard
deviation. Categorical variables were explained as number or percentage.
Comparisons between ERP and control groups were performed using studentt- test for continuous variables, Mann Whitney U test for
non-continuous variables, as appropriate. A two- sided p value of
<0.05 was considered to be statistically significant.