Date	Event	Description
11 November 2009	New citation required but conclusions have not changed	New author helped prepare the last update.
14 April 2008	Amended	Converted to new review format.
30 March 2008	New search has been performed	Search updated. Thorp 2003 study found which is a follow‐up report on the Thorp 1994 trial ‐ this reports developmental outcomes in children at age seven.
19 March 2003	New search has been performed	Search updated. Three new references found relating to existing included trials. No new trials. One publication awaiting assessment which appears to be an additional report of Thorp 1994.
30 September 2000	New search has been performed	Search updated. Three new references found, including one new trial.