Author | Randomized trial (selection bias) | Allocation concealment (selection bias) | Blind selection (performance bias) | Blind evaluation (measurement bias) | Data deficient (attrition bias) | Literature quality |
---|---|---|---|---|---|---|
Alcántara et al. [1] | − | − | o | + | − | High |
Cheung et al. [2] | − | − | o | + | − | High |
Ho et al. [3] | − | − | o | o | − | High |
Pirlet et al. [4] | − | − | o | + | − | High |
van Hooft et al. [5] | − | − | o | o | − | High |
Note: +: high risk, o: not available, and −: low risk.