| Date | Event | Description |
|---|---|---|
| 8 November 2008 | New search has been performed | There were 5 studies in the first version of this review published in 2001. In the 2008 update one study was removed as not truly a RCT Matthews 1968 and 6 new studies were added. Bassol 2000; Davis 2005; Winkler 2003; Endrikat 1999; Serfaty 1998 |
| 25 June 2008 | Amended | Converted to new review format. |
| 18 February 2008 | New citation required and conclusions have changed | Substantive amendment |
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