Table. 2.

The distribution of included quality according to QUADAS-2 tool

	Afifi 2016 [9]	Du 2014 [10]	Ebraheem 2017 [11]	Goshima 2008 [12]	Hassan 2009 [13]	Kokabi 2015 [14]	Li 2016 [15]	Mannelli 2009 [16]	Wu 2017 [17]	Xiao 2008 [18]	Yousef 2017 [19]	Yuan 2014 [20]
Ris of bias	U	U	U	L	U	U	U	L	U	L	U	L
Patient selection	L	L	L	L	L	L	L	L	L	L	L	L
Index Test	U	U	U	L	U	U	U	L	U	L	U	L
Reference standard	L	L	L	L	L	L	L	L	L	L	L	L
Flow and timing	L	L	L	L	L	L	L	L	L	L	L	L
Applicability Concerns	L	L	L	L	L	L	L	L	L	L	L	L
Patient selection	L	L	L	L	L	L	L	L	L	L	L	L
Index Test	U	U	U	L	U	U	U	L	U	L	U	L
Reference standard	L	L	L	L	L	L	L	L	L	L	L	L

L Low, U Unclear