Date	Event	Description
3 July 2018	Review declared as stable	See Published notes
29 October 2015	New search has been performed	We updated the searches in April 2016. We updated the results, 'Risk of bias' tables, flow of study selection, summary tables, and discussion.
29 October 2015	New citation required but conclusions have not changed	We added one new study with 14 participants, but the conclusions remain unchanged. Previous readers of the review should re‐read this update because we added another form of medical therapy to the pharmacological interventions.
16 December 2011	Amended	Changes to presentation of Table 3 and Table 1.
18 February 2009	Amended	Minor revisions made to the protocol text by the author
29 May 2008	Amended	Converted to new review format.