Table 2.

Quality assessment according to SYRCLE Risk Assessment Tool.

Item	Type of Bias	Domain	Kim et al. 2011 [25]	Topcuoglu et al. 2013 [26]
1	Selection bias	Sequence generation	-	+
2	Selection bias	Baseline characteristics	+	+
3	Selection bias	Allocation concealment	?	+
4	Performance bias	Random housing	?	?
5	Performance bias	Blinding	-	?
6	Detection bias	Random outcome assessment	-	+
7	Detection bias	Blinding	-	?
8	Attrition bias	Incomplete outcome data	+	+
9	Reporting bias	Selective outcome reporting	+	+
10	Other	Other sources of bias	?	?