Epoch Analysis of On-Treatment Disability Progression Events over Time in the Tysabri Observational Program (TOP). Wiendl H, Butzkueven H, Kappos L, Trojano M, Pellegrini F, Paes D, Zhang A, Belachew S, Tysabri® Observational Program(TOP) Investigators PLoS One. 2016; 11(1):e0144834. Epub 2016 Jan 15. PMID: 26771747. Abstract CommentRecommendBookmarkWatch