| Date | Event | Description |
|---|---|---|
| 23 July 2008 | New search has been performed | Searches re‐run and no new trials found. The review was assessed as up to date. |
| 23 July 2008 | Amended | Converted to new review format. |
| 14 December 2007 | Amended | New plain language summary added. |
| 3 April 2006 | New search has been performed | Searches re‐run and no new trials found. The review was updated with no changes other than dates of last search. |
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