Date	Event	Description
17 October 2014	Review declared as stable	This review will be assessed for updating in 2019, or sooner if new evidence becomes available.
30 May 2014	New search has been performed	New searches were run in December 2013, and Risk of bias tables were added.
30 May 2014	New citation required but conclusions have not changed	No new studies were found for inclusion in this review update.
27 June 2012	Amended	Contact details updated.
29 May 2012	Amended	The contact details of Patrick Mahar were amended for this update review conducted in April 2011.
4 August 2011	New citation required and conclusions have changed	This update includes one new study by Wasiak 2011 involving 45 participants. Previous readers of this review would benefit from re‐reading this review as there is now one small study included.
4 August 2011	New search has been performed	This review was brought up to date to April 2011; the original review was published in Issue 3, 2007.
24 September 2010	Amended	Contact details updated.
30 October 2008	Amended	Converted to new review format.