Statistical Method
The IBM SPSS Statistics (version 22.0 IBM Corp., Armonk, NY) software program was used to analyze the data. Categorical variables are presented as numbers (n) or percentages (%), continuous variables are presented as median (25th-75th percentiles). Correlation analysis and comparisons were performed using Spearman’s correlation analysis, Wilcoxon test and Chi-square test were used for the analysis of non-normally distributed data. A p-value < 0.05 was considered significant.