| Date | Event | Description |
|---|---|---|
| 26 November 2010 | New search has been performed | New searches run. We identified no new studies. One additional study was excluded (Redon 2010). |
| 20 October 2008 | Amended | Converted to new review format. |
| 20 February 2008 | New search has been performed | The review was updated following a new search (June 2007). One new included study (Mira 2003) and one new excluded study (Solvay 2007) were incorporated. No changes were made to the conclusions of the review. |
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