Date	Event	Description
15 April 2014	New citation required but conclusions have not changed	New authors joined review team. Risk of bias assessments added and methods updated to reflect current standards. Conclusions not changed
18 October 2013	New search has been performed	Searches rerun; eight new studies included and seven new studies excluded
9 May 2008	Amended	Converted to new review format
11 November 2007	Feedback has been incorporated	Feedback and authors' response to feedback added. Unpublished trial Otsuka 1996b (Otsuka 21‐94‐201) is a duplicate reference to Strandness 2002
7 November 2007	New citation required but conclusions have not changed	Two excluded studies added. No change to conclusions
21 February 2007	Amended	Edited update. Abstract edited to include unit of measurement in results section