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 have 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.