| Date | Event | Description |
|---|---|---|
| 11 February 2015 | Amended | Contact details updated. |
| 9 January 2014 | New citation required but conclusions have not changed | Expanded from two to three included studies and added new author. One additional study awaits assessment. |
| 9 January 2014 | New search has been performed | New search conducted January 2014. |
| 5 February 2008 | New search has been performed | Minor update |
| 5 November 2007 | New search has been performed | Searches were re‐run and no additional trials were found. |
| 14 November 2005 | New search has been performed | Substantive amendment |
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