| Date | Event | Description |
|---|---|---|
| 10 February 2010 | New citation required and conclusions have changed | The review has been updated with the results of 24 additional trials |
| 1 June 2006 | New search has been performed | May 2006 The searches were updated in January 2004 as part of a Health Technology Assessment (HTA) project. Two new studies have been included (Naumenko 2003; Zhao 2003), with the results of the review amended accordingly |
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