| Date | Event | Description |
|---|---|---|
| 4 July 2012 | New citation required but conclusions have not changed | Minor copy edits made. The review was assessed as up to date. Conclusions not changed. |
| 4 July 2012 | New search has been performed | Searches re‐run, no new trials found. The review was assessed as up to date. |
| 9 February 2009 | Amended | Correction to placement of search strategy and spelling error. |
| 6 May 2008 | Amended | New MEDLINE highly sensitive search filter added. |
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