| Date | Event | Description |
|---|---|---|
| 7 October 2009 | New search has been performed | This is an update. The search was re‐run in July 2009 and no further studies were added to the most recent publication of this review, therefore the conclusions remain the same. |
| 7 October 2009 | Review declared as stable | This review no longer requires an update as evidence is unlikely to become available. In the event that new evidence does become available the review will be updated again. |
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