Exploratory Study to Assess the Effect of Fampridine (BIIB041) on Walking Ability and Balance in Participants With Multiple Sclerosis. (MOBILE) ClinicalTrials.gov, 17 Jul 2014 Accessed on 5 May 2015 from https://www.clinicaltrials.gov/ct2/show/NCT01597297. CommentRecommendBookmarkWatch