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Assessments of risk of bias of the randomized controlled trials
| Studies | Sequence generation | Allocation concealment | Blinding | Incomplete outcome data | Selective outcome reporting |
|---|---|---|---|---|---|
| Zyto 1997 | Sealed envelope | Yes | Unclear | No | Yes |
| Olerud 2011 | Independently prepared opaque, sealed envelopes | Yes | Unclear | No | Yes |
| Fjalestad 2012 | Numbered and sealed non-translucent envelopes | Yes | Unclear | Yes | Yes |
