Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk
Allocation concealment (selection bias)	Unclear risk
Blinding of participants and personnel (performance bias)	Unclear risk
Blinding of outcome assessment (detection bias)	Unclear risk
Incomplete outcome data (attrition bias)	Unclear risk
Selective reporting (reporting bias)	Unclear risk
Other bias	Unclear risk
Was the allocation sequence adequately generated?	Low risk	Quote: “Participants were randomly assigned into the intervention group and control group according to the sequence of enrolment and randomised numbers produced by SPSS 19.0 software”
		Comment: Adequately done
Was the allocation adequately concealed?	Unclear risk	Comment: Insufficient information to permit judgement
Were baseline outcome measurements similar?	Low risk	Comment: Baseline outcomes were similar across groups
Were baseline characteristics similar?	Low risk	Comment: Baseline characteristics were similar across groups
Were incomplete outcome data adequately addressed?	High risk	Comment: 11/101 × 100 = 10.9% lost to follow‐up
Was knowledge of the allocated intervention adequately prevented during the study?	Unclear risk	Comment: Insufficient information to permit judgement
Was the study adequately protected against contamination?	Unclear risk	Comment: Insufficient information to permit judgement
Was the study free from selective outcome reporting?	Unclear risk	Comment: Published protocol not found. The outcomes specified in the methodology section have been reported in the results section
Was the study free from other risk of bias?	Low risk	Comment: No other potential sources of bias reported