| Date | Event | Description |
|---|---|---|
| 27 January 2013 | New search has been performed | Updated search identified new trials for inclusion (Violaris 2010; Aydemir 2011a; Aydemir 2011b). |
| 4 June 2009 | New citation required and conclusions have changed | Substantive update. |
| 14 October 2007 | New citation required and conclusions have changed | Substantive amendment. |
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