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?	High risk	Comment: Quasi‐experimental trial
Was the allocation adequately concealed?	High risk	Comment: Quasi‐experimental trial
Were baseline outcome measurements similar?	Unclear risk	Comment: Insufficient information to permit judgement
Were baseline characteristics similar?	Unclear risk	Comment: Insufficient information to permit judgement
Were incomplete outcome data adequately addressed?	Unclear risk	Comment: The reasons for loss of follow‐up was not described
Was knowledge of the allocated intervention adequately prevented during the study?	High risk	Comment: Quasi‐experimental trial
Was the study adequately protected against contamination?	High risk	Comment: Quasi‐experimental trial
Was the study free from selective outcome reporting?	Unclear risk	Comment: Study protocol was not available to permit judgment
Was the study free from other risk of bias?	Low risk	Comment: No potential source of bias reported