Interferon β for secondary progressive multiple sclerosis: a systematic review. La Mantia L, Vacchi L, Rovaris M, Di Pietrantonj C, Ebers G, Fredrikson S, Filippini G J Neurol Neurosurg Psychiatry. 2013 Apr; 84(4):420-6. Epub 2012 Sep 05. PMID: 22952326. Abstract CommentRecommendBookmarkWatch