Date	Event	Description
6 November 2008	Amended	Converted to new review format.
5 May 2007	New search has been performed	A new search of the Group's Inborn Errors of Metabolism Trials Register identified six references which were found not to be eligible for inclusion in the review.
31 March 2006	New search has been performed	A new search of the group's register identified two references to one study which has been listed under Excluded studies (Robertson 2004).
5 April 2004	New search has been performed	The search for trials identified one further reference to the already included US/PKU Collaborative 1997 trial. This reference contained no further data for inclusion in the review.
6 February 2003	New search has been performed	Two further publications containing data from one of the included studies (US/PKU Collaborative) have been identified. Only data relating to phenylalanine intake could be extracted from these for inclusion in the review. The inclusion of these data does not affect the overall results of this review.