Fig. 2

Summary of methodological quality of studies according to the QUADAS-2 (Quality Assessment of Diagnostic Accuracy Studies-2) tool. High-quality study: a study that had no domain with a high risk of bias and no domain with high applicability concerns; medium/moderate-quality study: a study that had domain with an unclear risk of bias or domain with unclear applicability concerns; low-quality study: a study that had a domain with a high risk of bias and domain with high applicability concerns