Table III.

Risk of bias in included studies.

A, RCTs
First author, year (Ref.)	Random sequence generation	Allocation concealment	Blinding of participants and personnel	Blinding of outcome assessment	Incomplete outcome data	Selective reporting	Other bias
Lim 2014(19)	Low risk	Low risk	High risk	High risk	Low risk	Unclear risk	Low risk
Charette 2015(18)	Low risk	Low risk	High risk	High risk	Low risk	Unclear risk	Low risk
Büyükyilmaz 2013(17)	Unclear risk	Unclear risk	High risk	High risk	Low risk	Unclear risk	Low risk
B, Non-RCTs
Study	Bias in selection of participants	Bias due to confounding	Bias in classification of intervention	Bias due to deviations from intended interventions	Bias due to missing data	Bias in measurement of outcomes	Bias due to selective outcome reporting
Schneider 2018(20)	High risk	Unclear risk	Low risk	Unclear risk	Low risk	High risk	Unclear risk
Lim 2017(21)	Unclear risk	Unclear risk	Low risk	Unclear risk	Low risk	High risk	Unclear risk

RCT, randomized controlled trial.