| Date | Event | Description |
|---|---|---|
| 5 November 2008 | Amended | Converted to new review format. |
| 18 February 2008 | New search has been performed | January 2008: A new update search was run. Three trials for consideration were retrieved; none of these met the inclusion criteria. |
| 26 February 2001 | New citation required and conclusions have changed | Substantive amendment |
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