| Date | Event | Description |
|---|---|---|
| 18 September 2008 | Amended | Converted to new review format. |
| 9 November 2004 | New search has been performed | We have added two new trials (Dare 2002; Wong 2002) , one new ongoing trial (Manidakis 1999) and a new report of Magann 1998b. We have excluded four new trials (Bergsjo 1989; Foong 2000; Gemer 2001; McColgin 1993). |
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