| Date | Event | Description |
|---|---|---|
| 4 May 2017 | Review declared as stable | See Published notes. |
| 6 March 2015 | New search has been performed | This review has been updated; a risk of bias table has been added and a PRISMA flowchart have been included for this update. Two ongoing studies have been identified in trials registers. |
| 15 October 2014 | New citation required but conclusions have not changed | One new study has been identified for inclusion, but the conclusions remain unchanged. |
| 8 June 2014 | Amended | Edited by authors |
| 24 March 2014 | New search has been performed | Review updated |
| 24 March 2014 | Amended | Change of author |
| 9 November 2009 | Amended | Contact details updated. |
| 30 June 2008 | Amended | Protocol converted to new review format. |
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