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Assessment of Risk of Bias of Controlled Trials Using the Cochrane Risk of Bias Tool.5
| Study | Random Sequence Generation | Allocation Concealment | Blinding of Participants and Personnel | Incomplete Outcome Data | Selective Outcome Data |
|---|---|---|---|---|---|
| Breivik et al47 | Low | Low | Low | Low | Low |
| Likar et al48 | High | High | High | Unknown | Low |
| Rauck et al49 | Unknown | Unknown | Low | Unknown | Low |
| Kjaersgaard-Andersen et al50 | Unknown | Unknown | Low | Low | Low |
