| Date | Event | Description |
|---|---|---|
| 9 May 2008 | Amended | Converted to new review format |
| 11 November 2007 | Feedback has been incorporated | Feedback and authors' response to feedback added. Unpublished trial Otsuka 1996b (Otsuka 21‐94‐201) is a duplicate reference to Strandness 2002 |
| 7 November 2007 | New citation required but conclusions have not changed | Two excluded studies added. No change to conclusions |
| 21 February 2007 | Amended | Edited update. Abstract edited to include unit of measurement in results section |
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