| Date | Event | Description |
|---|---|---|
| 1 June 2011 | New citation required and major changes | New first author and new additional author. Background and methodology sections of protocol brought up to date. Modification in title and outcomes. |
| 12 August 2008 | Amended | Converted to new review format. |
| 12 May 2004 | Amended | Minor amendments were made to this protocol in May 2004 to aid clarity concerning the range of interventions. |
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