| Date | Event | Description |
|---|---|---|
| 3 December 2008 | New search has been performed | A new update search was performed on 4 March 2008. Some new studies were retrieved for inclusion or exclusion. Three new studies have been included in the updated review, and 4 new studies have been excluded. |
| 3 December 2008 | New citation required but conclusions have not changed | The title of this updated review has changed |
| 15 May 2006 | New search has been performed | New searches revealed one incomplete trial and two non‐RCTs. However, none met the inclusion criteria for this review. The Results and conclusions of the review remain unchanged. |
| 11 February 2004 | New citation required and conclusions have changed | Substantive amendment |
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