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Risk of bias of the included studies.
| First author, year (ref.) | Random sequence generation | Allocation concealment | Blinding of patients | Blinding of therapists | Incomplete outcome data | Selective reporting | Other bias |
|---|---|---|---|---|---|---|---|
| Crawford, 1999 (7) | Low | Low | Low | Low | High | Low | Unclear |
| McMillan, 2012 (8) | Low | Low | Low | Low | Low | Low | Unclear |
| Abdihakin, 2012 (9) | Low | Unclear | Low | Low | Low | Low | Unclear |
| Ball, 2013 (10) | Low | Unclear | Low | Low | Low | Low | Unclear |
