Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	“Randomization was by permuted block”
Allocation concealment (selection bias)	Unclear risk	Randomization by sealed envelopes, not clear if opaque.
Blinding of participants and personnel (performance bias)	High risk	Blinding of participants and personnel was not possible due to the nature of the intervention and study design.
Blinding of outcome assessment (detection bias)	Unclear risk	No description of blinding of outcome assessment was provided.
Incomplete outcome data (attrition bias)	Unclear risk	Insufficient reporting of attrition/exclusion (no reasons for missing data provided). Lost to follow‐up reported at 7 months, not at 14 months. Reasons for attrition reported only for the experimental sample.
Selective reporting (reporting bias)	Low risk	No evidence of reporting outcome selectively was detected.
Other bias	Low risk	No evidence of other biases was detected.