| Date | Event | Description |
|---|---|---|
| 3 October 2012 | New search has been performed | Searches were updated in September 2012: No new studies were identified |
| 16 December 2010 | New search has been performed | We updated the searches in December 2010 and identified one new study for possible inclusion; however the trial is ongoing. We will decide whether to include this study in a subsequent update of this review |
| 20 August 2008 | Amended | We converted this review to the new review format |
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