| Date | Event | Description |
|---|---|---|
| 12 October 2016 | Amended | Author information (affiliation) updated. |
| 10 November 2015 | Amended | Author information (affiliation) updated. |
| 20 December 2013 | New search has been performed | Five new trials have been added, making a total of 10 randomised controlled trials (RCTs) |
| 20 December 2013 | New citation required but conclusions have not changed | There has been no significant alteration to the conclusions of the original review |
| 2 October 2008 | Amended | Converted to new review format. |
| 23 May 2007 | New citation required and conclusions have changed | Substantive amendment |
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