| Date | Event | Description |
|---|---|---|
| 11 August 2011 | New citation required but conclusions have not changed | Two new trials added (Kashanian 2010; Kaunitz 2009), along with a 2009 secondary paper for Hampton 2001. An ongoing trial was updated (Bayer 2011). |
| 4 May 2011 | New search has been performed | Searches updated |
| 20 January 2010 | Amended | author order changed |
| 25 November 2008 | New search has been performed | Searches were updated; included a secondary article from earlier trial (Hampton 2001). Also added searches of clinical trials databases. |
| 15 April 2008 | Amended | Converted to new review format. |
| 8 May 2006 | New citation required and conclusions have changed | Substantive amendment |
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