| Date | Event | Description |
|---|---|---|
| 5 May 2009 | New search has been performed | The searches have been completed to November 2008. In the four years since the previous version of this Cochrane Review was published, there have been two new randomised trials and we also added a trial published in 1986 which was not identified in the previous review. The new trials included data on 750 operations and 17 stroke/death outcomes. The conclusion of this updated review is more conservative than that in the previous review. |
| 5 May 2009 | New citation required and conclusions have changed | The authorship of the review has changed. The conclusion of the review has changed. |
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