Is It Too Early to Predict the Failure of Natalizumab in NMO?-Reply. Kleiter I, Hellwig K, Berthele A, Kümpfel T, Linker RA, Hartung H-P, Paul F, Aktas O, for the Neuromyelitis Optica Study Group(NEMOS) Arch Neurol. 2012 Aug 1; 69(8):1085-1086. PMID: 22892675. Abstract CommentRecommendBookmarkWatch