Intramuscular interferon beta-1a therapy in patients with relapsing-remitting multiple sclerosis: a 15-year follow-up study. Bermel RA, Weinstock-Guttman B, Bourdette D, Foulds P, You X, Rudick RA Mult Scler. 2010 May; 16(5):588-96. Epub 2010 Feb 18. PMID: 20167591. Abstract CommentRecommendBookmarkWatch