| Date | Event | Description |
|---|---|---|
| 12 August 2008 | New search has been performed | Search strategy re‐run. No new RCTs identified. Text of the review updated especially the review methodology, results, discussion and conclusions. |
| 26 May 2008 | New search has been performed | Converted to new review format. |
| 31 March 2008 | New citation required and conclusions have changed | Substantive amendment |
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