| Date | Event | Description |
|---|---|---|
| 11 July 2016 | New citation required but conclusions have not changed | Issue 3, 2017: two new trials were included in the review (Chen 2013; Minguini 2012). Inclusion of GRADE |
| 11 July 2016 | New search has been performed | Issue 3, 2017: electronic searches were updated |
| 7 December 2011 | New citation required but conclusions have not changed | Issue 2, 2012: electronic searches were updated but no new trials were identified. |
| 7 December 2011 | New search has been performed | Issue 2, 2012: the 'Risk of bias' assessments were updated according to new Cochrane methodology. |
| 14 October 2008 | Amended | Converted to new review format. |
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