| Date | Event | Description |
|---|---|---|
| 16 July 2010 | New citation required but conclusions have not changed | New authors updated the review. |
| 30 April 2010 | New search has been performed | Search updated. No new studies identified. Four studies previously awaiting classification have now been excluded (Caceres 1979; Caceres 1981a; de Holanda 2003; Edwards 2007). |
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