| Date | Event | Description |
|---|---|---|
| 12 November 2008 | Amended | Corrections made to data for two trials (Wyatt 1990 and Caruso 2006). |
| 28 May 2008 | Amended | Converted to new review format. |
| 6 April 2007 | Amended | New protocol published 2007, Issue 3. Title change. |
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