Table 3.

Risk of bias assessment for included trials (n=4)

Study	Random sequence generation (selection bias)	Allocation concealment (Selection bias)	Blinding of participants and personnel (performance bias)	Blinding of outcome assessment (detection bias)	Incomplete outcome data addressed (attrition bias)	Selective reporting (reporting bias)
Wang et al.,[35] 2016	Yes	Yes	Yes	Yes	No	No
Sepehrmanesh et al.,[34] 2016	Yes	Yes	Yes	Yes	No	No
Mozaffari-Khosravi et al.,[32] 2013	Yes	Not mentioned	No	No	No	No
Khoraminya et al.,[33] 2013	Yes	Not mentioned	Yes	Yes	No	No