| Date | Event | Description |
|---|---|---|
| 11 December 2013 | New citation required but conclusions have not changed | Review updated with new trials but no overall changes to conclusions. |
| 15 October 2012 | New search has been performed | Results of update search in July 2012 added to review; risk of bias tables and description of bias added; background information, results and discussion extended; structure of the review updated. |
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