title: Immunosuppressive drug therapy with plasmapheresis in chronic progressive multiple sclerosis: a controlled study.
mesh_terms: D003131:Combined Modality Therapy; D004311:Double-Blind Method; D006801:Humans; D007165:Immunosuppression Therapy; D009103:Multiple Sclerosis / Q000628:therapy*; D010956:Plasmapheresis