| Date | Event | Description |
|---|---|---|
| 30 May 2008 | Amended | Converted to new review format. |
| 4 November 1999 | Feedback has been incorporated | Feedback received and added to the review. In response to the feedback, the review authors contacted the authors of the Oxford trial for the method of randomisation. The randomisationmethod of the Oxford trial was added to the Characteristics of included studies table (3 January 2000). |
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