| Date | Event | Description |
|---|---|---|
| 27 August 2014 | New citation required but conclusions have not changed | The conclusions of the review have not changed. |
| 27 August 2014 | New search has been performed | We updated the searches to November 2013. We have added 18 new studies, bringing the total number of included studies to 37, involving a total of 1019 participants. We have revised the review throughout. |
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