Date	Event	Description
13 August 2015	Feedback has been incorporated	Feedback comment and reply added to the review.
7 August 2014	New citation required but conclusions have not changed	Our conclusions remain unchanged.
7 August 2014	New search has been performed	Searches updated. No new trials were included and two trials were excluded (Nantz 2012; Polanco‐Rojas 2013).
9 December 2011	New search has been performed	Searches updated. No new trials were included and one trial was excluded (Yakoot 2011).
9 December 2011	New citation required but conclusions have not changed	The conclusions of our review remain unchanged.
26 July 2009	Feedback has been incorporated	Clarification in Plain language summary, Results (Summary) and Results (Main document).
9 July 2008	Amended	Converted to new review format.