Date	Event	Description
13 September 2017	New search has been performed	We have updated this review to include the results of a new search conducted in September 2017.
5 September 2017	New citation required and conclusions have changed	Since the last version of this review (published in 2013), 20 new relevant RCTs including 2156 participants have provided additional information to change some of the review conclusions. This second update differs from the first update of the review by: (1) assessing the quality of the body of evidence using GRADE; and (2) amending psychological intervention categories to more closely reflect presumed mechanisms of treatment effect.
2 September 2013	New citation required and conclusions have changed	Since the last version of this review (published in 2006), new relevant studies have provided additional information to change the conclusions.
20 March 2013	New search has been performed	Review updated. This update differed from the original review by limiting the included studies to true RCTs published in academic journals (i.e. excluded quasi‐randomized trials and dissertation studies). As such we excluded seven studies from the 28 included in the original review and added an additional 18 studies from this review update, for a total of 39 RCTs included in the update.
24 September 2010	Amended	Contact details updated.
13 May 2009	Amended	Contact details updated.
2 July 2008	Amended	Converted to new review format.