Table 2. Quality Assessment of Studies of Diagnostic Accuracy included in Systematic Review (QUADAS-2).

Study	Risk of bias				Applicability concerns
	Patient selection	Index test	Reference standard	Flow and timing	Patient selection	Index test	Reference standard
Braticevici 2013	H	L	H	U	U	U	U
Cassinotto 2013	L	L	H	H	U	U	U
Friedrich-Rust 2011	H	L	H	U	U	L	U
Guzmán-Aroca 2012	H	U	H	U	U	L	U
Osaki 2010	H	L	H	U	L	U	U
Palmeri 2011	L	L	L	U	U	L	U
Yoneda 2010	H	H	H	U	L	H	U

Abbreviations: H, high; L, low; U, unclear