| Date | Event | Description |
|---|---|---|
| 18 August 2015 | New search has been performed | Issue 11, 2015: An updated search in August 2015 yielded no new randomised controlled trials for inclusion. |
| 18 August 2015 | New citation required but conclusions have not changed | Issue 11, 2015: A number of new references have been added to the 'Background' and 'Discussion' sections. Some of the sections have been reorganised using new subheadings and the abstract and plain language summary have been edited to meet new Cochrane methodological standards. |
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