Statistical analysis
Paired forest plots of sensitivity and specificity with corresponding 95% confidence intervals were produced for each protocol measuring the main outcome of EP. Considering the potential threshold effect, we decided to use summary receiver operating characteristic(SROC) curves to evaluate the accuracy of the model. The area under the ROC curve(AUC) was calculated by numerical integration of the SROC curve area. All analyses were performed using R. version 3.6.3 and Revman version 5.4.