| Date | Event | Description |
|---|---|---|
| 7 November 2008 | Amended | Converted to new review format. |
| 24 January 2007 | New search has been performed | January 2007: an update search was performed and revealed no new references or trials in this area. The conclusions of the review remain unchanged. |
| 8 April 2005 | New search has been performed | April 2005: an update search was performed and revealed no new references or trials in this area. The conclusions of the review therefore remain unchanged. |
| 18 November 2002 | New citation required and conclusions have changed | Substantive amendment |
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