| Date | Event | Description |
|---|---|---|
| 23 September 2009 | Amended | Search updated. Four new reports added to Studies awaiting classification (Caceres 1979; Caceres 1981a; de Holanda 2003; Edwards 2007). |
| 14 April 2008 | Amended | Converted to new review format. |
| 1 December 2002 | New search has been performed | Search updated. No new trials identified. |
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