| Date | Event | Description |
|---|---|---|
| 14 August 2015 | New citation required but conclusions have not changed | A new team of authors updated this review. |
| 14 August 2015 | New search has been performed | Searches updated. We identified 186 records in the updated search. After processing the results according to the inclusion criteria, we did not identify any new studies that could be included in the review. |
| 28 February 2011 | New search has been performed | Searches conducted. No new trials were included or excluded in this updated review. |
| 7 May 2008 | New search has been performed | Searches updated. No new trials were identified and the conclusions of the original review remain unchanged. |
| 28 April 2008 | Amended | Converted to new review format. |
| 4 November 2005 | New search has been performed | Searches conducted. |
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