| Date | Event | Description |
|---|---|---|
| 12 November 2009 | Feedback has been incorporated | Feedback received from a trialist received 3 November 2009 concerning the DOSE 2002 study was addressed on 10 November 2009 |
| 13 May 2009 | New citation required but conclusions have not changed | Incorrect 'date assessed as up to date' changed from February 2000 to March 2007 (date of last electronic searches). Abstract corrected to reflect true history of searches |
| 13 August 2008 | New search has been performed | This is an updated version of a previous review published in the BMJ in 2001 and includes several new trials |
| 30 July 2008 | Amended | Converted to new review format |
| 21 February 2000 | New citation required and conclusions have changed | Substantive amendment |
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