Efficacy and safety of natalizumab treatment for relapsing-remitting multiple sclerosis: interim results of the tysabri(r) observational programme in the uk. Hanna J, Rosen J P, Smethurst C J Neurol Neurosurg Psychiatry. 2013 Nov; 84(11):e2. PMID: 24108955. Abstract CommentRecommendBookmarkWatch