Table 3.

Summary of the risk of bias for randomized controlled trial studies according to the Cochrane Collaboration tool for assessing risk of bias

Authors	Design	Random sequence generation	Allocation concealment	Blinding of outcome assessment	Incomplete outcome data	Selective reporting	Others	Risk of bias
Katchooi et al.	RCT	Low	Low	Low	Low	Low	Low	Low
Alansari et al.	RCT	Low	High	Low	High	Unclear	Low	High
Luca Lombardo et al.	RCT	Low	High	Low	Low	Unclear	Low	High
Bragassa et al.	RCT	Low	High	Low	Low	Low	Unclear	High

RCT: Randomized controlled trial