Table 3.

Risk of bias assessment according to the Cochrane collaboration tool

Study, yref	Random sequence generation	Allocation concealment	Blinding of participants and personnel	Blinding of outcome assessment	Incomplete outcome data	Selective reporting	Summary of overall assessment
Homayouni et al., 201827	Low	Low	Low	Unclear	Low	Low	Unclear
Salden et al., 201637	Low	Unclear	Low	Low	Low	Low	Unclear
Eghtesadi et al., 201526	Unclear	Unclear	Low	Unclear	Low	Low	Unclear
Rangel et al., 201538	Low	Unclear	Low	Unclear	Low	Low	Unclear
Morand et al., 201140	Low	Unclear	Low	Low	Low	Low	Unclear
Rizza et al., 201139	Unclear	Unclear	Low	Unclear	Unclear	Low	Unclear