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Showing articles 0 to 1 of 1 Filter Applied: interferon beta 1-a (Click to remove) Progressive Multifocal Leukoencephalopathy Complicating Treatment with Natalizumab and Interferon Beta-1a for Multiple Sclerosis NEJM 353:369-374,414,432, Kleinschemidt-DeMasters,B.K. &Tyler,K.L., 2005 Showing articles 0 to 1 of 1