Fig. 1: Systematic search selected studies and their quality control results.

a PRISMA chart illustrating studies removed for being irrelevant or heterogeneous for the meta-analysis. b PCA biplot of QC measures (Internal Quality Control (IQC), Accuracy Quality Control (AQC), Consistency Quality Control (CQC), and Standardized Mean Rank (SMR)) demonstrating that the 5 studies are conceding with at least one of these quality measures of MetaQC. c Summary table of MetaQC results covering IQC, AQC, CQC, and SMR where the high score represents high consistency and the low one represents low consistency.