| Date | Event | Description |
|---|---|---|
| 29 December 2010 | New search has been performed | Search strategies amended and updated. Text reviewed but conclusions unchanged. No new RCTs included. |
| 9 October 2007 | New search has been performed | Searches were re‐run on 10 October 2007. No additional trials were identified. |
| 11 July 2004 | New citation required and conclusions have changed | Substantive amendment |
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