| Date | Event | Description |
|---|---|---|
| 10 September 2010 | New search has been performed | Search updated. One new trial included (Founds 2006), conclusions unchanged. |
| 1 October 2009 | New search has been performed | Search updated. One report added to Studies awaiting classification (Founds 2006). |
| 1 September 2008 | Amended | Converted to new review format. |
| 30 September 2001 | New search has been performed | Search updated. |
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