Table 4.

Risk of bias assessment

		Random sequence generation bias (selection bias)	Allocation concealment (selection bias)	Blinding of participants and personnel (performance bias)	Blinding of outcome assessment (detection bias) Patient-reported outcomes	Blinding of outcome assessment (detection bias) Evaluator-reported outcomes	Incomplete outcome data (attrition bias) Post-treatment	Incomplete outcome data (attrition bias) Follow-up	Selective reporting (reporting bias)
Comer et al. (USA) [28]	Non-RCT	Not applicable	Not applicable	Not applicable	Unclear risk	Low risk	Low risk	Not applicable	Low risk
Comer et al. (USA) [30]	RCT	Low risk	Low risk	Unclear risk	Unclear risk	Low risk	Low risk	Low risk	Unclear risk
Farrell et al., 2016 (Australia) [31]	Non-RCT	Not applicable	Not applicable	Not applicable	Unclear risk	Low risk	Low risk	Low risk	Low risk
Lenhard et al., 2014 (Sweden) [32]	Non-RCT	Not applicable	Not applicable	Not applicable	Unclear risk	Unclear risk	Low risk	Low risk	Low risk
Lenhard et al., 2017 (Sweden) [29, 33]	RCT	Low risk	Low risk	Unclear risk	Unclear risk	Low risk	Low risk	Low risk	Low risk
Storch et al., 2011 (USA) [34]	RCT	Low risk	Low risk	Unclear risk	Unclear risk	Unclear risk	Low risk	Low risk	Low risk