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Assessment of risk of bias of included randomized controlled trialsa
| Random sequence generation | Allocation concealment | Blinding of participants and personnel | Blinding of outcome assessment | Incomplete outcome data | Selective reporting | Other bias | Total | |
|---|---|---|---|---|---|---|---|---|
| O’Connor et al. [35] | A | A | A | A | A | A | A | A |
| Sullivan et al. [32] | A | A | C | A | A | A | A | C |
| Schanler et al. [37] | A | A | C | C | A | A | A | C |
| Cristofalo et al. [36] | A | A | A | A | A | A | A | A |
a A, high risk; B, moderate risk; C, low risk
