A single-center, randomized, double-blind, placebo-controlled study of interferon beta-1b on primary progressive and transitional multiple sclerosis von Montalban, X., Sastre-Garriga, J., Tintoré, M., Brieva, L., Aymerich, FX, Río, J., Porcel, J., Borràs, C., Nos, C., Rovira, À.

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