Table 1.

Summary of Quality Assessment of Diagnostic Accuracy Study (QUADAS-2) for Accepted Studies.

No.	First Author (Year)	Risk of Bias				Applicability Concerns
		Patient Selection	Index Test	Reference Standard	Flow and Timing	Patient Selection	Index Test	Reference Standard
1.	Wardi (2012)	U	L	L	L	L	L	L
2.	Peng (2005)	L	H	L	L	L	L	L
3.	Urita (2004)	L	H	L	L	L	L	L
4.	Wong (2003)	L	L	L	L	L	L	L
5.	Chua (2002)	L	L	L	L	L	L	L
6.	Kato (2002)	L	H	L	L	L	L	L
7.	Wong WM (2001)	L	H	L	L	L	L	L
8.	Wong BCY (2001)	L	L	L	L	L	L	L
9.	Peng (2000)	U	L	L	L	L	L	L
10.	Wong (2000)	L	H	L	L	L	L	L
11.	Wang (1998)	L	H	L	L	L	L	L

L = Low risk.

H = High risk.

U = Unclear risk.