Date	Event	Description
25 November 2013	Amended	This review has been withdrawn, seePublished notes.
5 April 2011	Amended	Byline altered; Fuensanta Meseguer added to acknowledgements as was not involved in the update of this review.
8 February 2011	Amended	Contact details updated.
10 November 2010	Review declared as stable	The authors declare that there is unlikely to be any further studies to be included in this review and so it should be published as a 'stable review'.
24 September 2010	Amended	Contact details updated.
20 July 2010	New citation required but conclusions have not changed	Data on use of rescue medication in original studies added to analyses. Review rewritten to conform with new Cochrane standards and methods.
11 March 2010	New search has been performed	New searches run. No new studies identified for inclusion.
28 May 2008	Amended	Converted to new review format.
23 May 2003	Feedback has been incorporated	Feedback incorporated