Table 1. Cochrane Collaboration’s tool.

Assessment of risk of bias of the randomised trials using Cochrane Collaboration’s tool

First Author	Bias	Authors’ Judgement	Support for Judgement
Honeybul 2017 [8]	Random sequence generation (selection bias)	Low Risk	Each participant was randomised according to a random sequence generated by a random number software
	Allocation concealment (selection bias)	Low Risk	Group allocation concealed.
	Blinding of participants and personnel (performance bias)	Unclear risk	No information given
	Blinding of outcome assessment (detection bias)	Unclear Risk	No information given
	Incomplete outcome data (attrition bias)	Low Risk	No missing data
	Selective reporting (reporting bias)	Low Risk	All outcome data reported
	Other bias	Low Risk	Similar baseline characteristics in both groups.
Honeybul 2018 [9]	Random sequence generation (selection bias)	Low Risk	Each participant was randomised according to a random sequence generated by a random number software
	Allocation concealment (selection bias)	Low Risk	Group allocation concealed.
	Blinding of participants and personnel (performance bias)	Unclear Risk	No information given
	Blinding of outcome assessment (detection bias)	Unclear Risk	No information given
	Incomplete outcome data (attrition bias)	Low Risk	No missing data
	Selective reporting (reporting bias)	Low Risk	All outcome data reported
	Other bias	Low Risk	Similar baseline characteristics in both groups