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| Study | Reason for exclusion |
|---|---|
| ACTRN12617000876392 | Wrong outcomes |
| Engel 2016 | Wrong outcomes |
| Forbes 2019 | Wrong study design |
| Gearry 2009 | Wrong study design |
| ISRCTN98226923 | Wrong indication |
| McCormick 2010 | Not an RCT |
| Spagnuolo 2017 | Not an RCT. According to the author no randomisation was performed; consecutive patients were enrolled and, alternating one by one, patients were placed in the experimental and control arm. |
| Tripp 2017 | Wrong outcomes |
RCT: randomised controlled trial
