| Date | Event | Description |
|---|---|---|
| 12 September 2008 | Amended | Converted to new review format. |
| 31 May 2007 | Amended | Searches were rerun for this review in June 2007 prior to its inclusion in an 'umbrella review' published in 'Evidence Based Child Health' in 2008. No new studies were found. It is anticipated that a full update of this review will appear in 2009. |
| 12 January 2005 | Amended | The version of this review appearing in Issue 2, 2005, contains a criticism of the review made late in 2004 by Drs S Edelson and B Rimland. The authors have responded in full, and no substantive change has been made to the review as a result of the criticism received. |
| 9 September 2003 | New citation required and conclusions have changed | Substantive amendment |
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