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Cochrane risk of bias table.
| RoB item | Sequence generation | Allocation concealment | Blinding of participants and personnel | Blinding of outcome assessors | Incomplete outcome data | Selective outcome reporting | Other sources of bias |
|---|---|---|---|---|---|---|---|
| References | |||||||
| McKenna et al. (36) | – | – | + | – | – | – | – |
| Arif et al. (37) | – | – | + | ? | – | – | – |
| Kreuzer et al. (38) | – | – | + | ? | – | – | – |
–, Low risk of bias; +, High risk of bias; ?, Unclear risk of bias.
