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Cochrane risk-of-bias scores.
| Study | Bias | ||||||
|---|---|---|---|---|---|---|---|
| Random Sequence Generation | Allocation Concealment | Blinding of Participants and Personnel | Blinding of Outcome Assessment | Incomplete Outcome Data | Selective Reporting | Other Bias | |
| Rolving et al. [20] | + | − | − | − | + | + | − |
| Louw et al. [23] | + | + | − | − | + | + | − |
| Nielsen et al. [25] | + | + | − | − | − | + | + |
| Lindbäck et al. [26] | + | + | − | + | − | + | − |
| Kesänen et al. [28] | + | + | + | + | + | + | − |
| Lee et al. [29] | + | + | − | − | + | + | − |
| Chuang et al. [30] | + | − | − | − | + | + | + |
+ low risk of bias; − high risk of bias.
