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Risk of bias in randomized controlled trials included in systematic review.
| Domain | BeST Allaart 2007 [22] |
COMET Anis 2009 [23] |
|---|---|---|
| Random sequence generation | Unclear | Low |
| Allocation concealment | Unclear | Low |
| Blinding (participants and personnel) | High | Low |
| Blinding (outcome assessment) | Low | Low |
| Incomplete outcome data | Unclear | Unclear |
| Selective reporting | High | Low |
| Other sources of bias | Unclear | Low |
