Date	Event	Description
13 August 2015	Amended	Additional feedback has been added, and this review has now been withdrawn. See Feedback 2 and Published notes.
11 May 2015	Feedback has been incorporated	Feedback on this review was submitted in February 2015. See Feedback section for details.
11 February 2013	New citation required but conclusions have not changed	None of the eleven additional studies identified significantly changed the outcome of the review.
6 February 2013	New search has been performed	Twenty one additional studies were identified in the updated search, eleven were included (Fallon 2011; Kress 2009; Lennernäs 2010; Mercadante 2007; Mercadante 2009; Portenoy 2006; Portenoy 2010; Rauch 2009; Rauch 2010; Rauch 2012; Slatkin 2007), and ten excluded (Ashburn 2011; Davies 2011; Hagen 2010; Johnson 2010; Rauch 2011; Rauch 2012b; Reynolds 2011; Reynolds 2012; Stanley 2011; Taylor 2010).
7 January 2013	Amended	Converted to new review format
13 October 2008	Amended	Converted to new review format.