| Date | Event | Description |
|---|---|---|
| 8 August 2011 | New search has been performed | Searches conducted. We included one trial, which was previously awaiting classification (Kogan 2003) and excluded three new trials (Dimopoulos 2007; Maimon 2008; Morris 2010). Our conclusions remain unchanged. |
| 11 June 2008 | Amended | Converted to new review format. |
| 17 July 2007 | New search has been performed | Searches conducted. |
| 19 March 2005 | Feedback has been incorporated | Feedback comment and reply added. |
| 9 January 2004 | New search has been performed | Searches conducted. |
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