| Date | Event | Description |
|---|---|---|
| 16 August 2012 | New citation required but conclusions have not changed | Recognising that new citation warranted for update in 2011. |
| 22 June 2011 | New search has been performed | Two new RCTs added: Bhattacharya 2008 and Steures 2006a. |
| 13 June 2008 | Amended | Converted to new review format. |
| 5 August 2006 | New citation required and conclusions have changed | Substantive amendment |
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