Table 2.

The results of the quality assessment using the QUADAS-2 tool

Studies	Risk of bias				Applicability concerns
	Patient selection	Index test	Reference standard	Flow and timing	Patient selection	Index test	Reference standard
Antoch et al4	Unclear	Low risk	High risk	Low risk	Low risk	Low risk	Low risk
Cerfolio et al5	Low risk	Low risk	High risk	Low risk	Low risk	Low risk	Low risk
Ohno et al6	Low risk	Low risk	High risk	Low risk	High risk	Low risk	Low risk
Yi et al7	Low risk	Low risk	High risk	Low risk	Low risk	Low risk	Low risk
Plathow et al8	High risk	Low risk	High risk	Low risk	High risk	Low risk	Low risk
Lee et al9	Low risk	Low risk	High risk	Low risk	Low risk	Low risk	Low risk
Opoka et al10	Unclear	Low risk	High risk	Low risk	High risk	Low risk	Low risk
Ohno et al15	Low risk	Low risk	High risk	Low risk	Low risk	Low risk	Low risk
Huellner et al16	Low risk	Low risk	High risk	Low risk	High risk	Low risk	Low risk
Lee et al17	Unclear	Low risk	High risk	Low risk	Low risk	Low risk	Low risk

Abbreviation: QUADAS-2, Quality Assessment of Diagnostic Accuracy Studies version 2.