Table 3.

Risk of bias assessment for randomized controlled trials based on the Cochrane Collaboration tool⁷

Study	Random sequence generation	Allocation concealment	Blinding of participants and researches	Incomplete outcome data	Selective reporting	Baseline imbalance	Sample size
Bowyer et al.12	High risk	High risk	Low risk	Low risk	Low risk	Low risk	Not calculated
Hall18	High risk	High risk	Low risk	Low risk	Low risk	Low risk	Not calculated