Statistical analysis
Continuous variables were presented as mean ±SD. Categorical variables were presented as counts (percentages). After measuring each variable, the accuracy and features of all of the pre-existing parameters were calculated via receiver operating characteristic (ROC) curve analysis. The optimal cutoff was selected based on the Youden index. Statistical analysis was performed using SPSS 23.0. A two-tailed p-value of <0.05 was considered statistically significant.