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Showing articles 0 to 2 of 2 Filter Applied: multiple sclerosis,chronic progressive (Click to remove) The Canadian Coop Trial of Cyclophosphamide and Plasma Exchange in Progr MS The Canadian Coop MS Study Group, Lancet 337:441-4461991., , 1991 Plasma Exchange in Chronic Progressive Multiple Sclerosis:A Long-Term Study Neurol 41:409-414, Khatri,B.O.,et al, 1991 Showing articles 0 to 2 of 2