| Date | Event | Description |
|---|---|---|
| 14 February 2011 | Amended | Link to anticoagulant feedback added |
| 11 September 2008 | Amended | Converted to new review format. |
| 23 February 2005 | New search has been performed | Review updated without change. Searches re‐run and no new trials found. |
| 14 May 2003 | New search has been performed | One additional excluded study added. There are no changes to the conclusions of the review. |
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