| Study | Reason for exclusion |
|---|---|
| Habek 2007 | Not a randomised controlled trial. |
| Harara 2011 | Different intervention. |
| Notten 2012 | Not a randomised controlled trial. |
| Paavonen 2012 | Not a randomised controlled trial. |
| Rogers 2007 | Randomised controlled trial, different intervention. |
| Sundaram 2007 | Not a randomised controlled trial. |
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