Table 7.

Quality rating of the 3 included studies related to symptoms (QUADAS −2 results).

Study	Risk of bias				Applicability concerns
	Patient selection	Index test	Reference standard	Flow and timing	Patient selection	Index test	Reference standard
2004, Rouse MW39
2003, Borsting EJ40
1999, Borsting E28

() low risk; () high risk; (?) unclear risk.