Park 2016a (ii).

Methods	As per Park 2016a (bilateral stimulation vs sham data set)
Participants	As data set 1
Interventions	Bilateral stimulation (n = 11) vs sham stimulation (n = 6)
Outcomes	As data set 1
Notes	As data set 1
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Blinding unclear
Allocation concealment (selection bias)	Unclear risk	Unclear
Blinding (performance bias and detection bias) All outcomes	High risk	Single‐blinded (assessors only)
Blinding of participants and personnel (performance bias) All outcomes	High risk	Reported only as single‐blinded (assessors only)
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Outcome assessors blinded
Incomplete outcome data (attrition bias) All outcomes	Low risk	2 lost to follow‐up
Selective reporting (reporting bias)	Low risk	All outcomes reported
Other bias	Low risk	None identified