Date	Event	Description
23 January 2013	New citation required and conclusions have changed	The conclusions of the review have changed. The previous version of this review concluded that, for the primary outcome (walking), the number needed to treat was six patients to prevent one dependency; this updated version of our review concludes that five patients need to be treated to prevent one dependency in walking.
14 January 2013	New search has been performed	We have updated the searches to December 2012 and revised the text as appropriate. We have included 23 trials with 999 participants in this update, compared with 17 trials with 837 participants in the previous version of this review from 2009.
28 July 2010	Feedback has been incorporated	Feedback and author response included in the Feedback section, and error corrected in the Abstract.
16 October 2009	New search has been performed	We have updated the searches to April 2009 and revised the text as appropriate. The conclusions of the review have not changed. We have included 17 trials with 837 participants in this update, as compared with eight trials with 414 participants in the previous version of this review from 2007. The previous version of this review concluded that, for the primary outcome (walking), the number needed to treat was four patients to prevent one dependency; this updated version of our review concludes that six patients need to be treated to prevent one dependency in walking.
6 August 2008	Amended	Converted to new review format.