| Date | Event | Description |
|---|---|---|
| 13 October 2008 | Amended | Converted to new review format. |
| 27 November 2007 | New search has been performed | An update search was done in November 2007; 6 RCTs were excluded but no new trials were included in the review |
| 16 March 2006 | New citation required and conclusions have changed | Substantive amendment |
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