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Kirzinger SS, Hurwitz BJ, Arnason BG, Bigley GK, Coyle PK, Goodin DS, Jeffery DR, Kaba S, Lynch S, Mandler RN, Mikol DD, Rammohan KW, Sater R, Sriram S, Thrower B, Boateng F, Jakobs P, Wash M, Bogumil TM, Salazar-Grueso E. First phase of the BEYOND programme: 1-year interim analysis of an open-label, extension study comparing 500 mcg and 250 mcg interferon beta-1b. JOURNAL OF NEUROLOGY. DR DIETRICH STEINKOPFF VERLAG; 2005. p. 126–127.