title: Biased assessment of blinding in a randomized placebo-controlled trial of oral methotrexate in chronic progressive multiple sclerosis.
mesh_terms: D015982:Bias; D002908:Chronic Disease; D004311:Double-Blind Method; D006801:Humans; D008727:Methotrexate / Q000627:therapeutic use; D009103:Multiple Sclerosis / Q000188:drug therapy; D016032:Randomized Controlled Trials as Topic / Q000379:methods*; D012107:Research Design; D016896:Treatment Outcome
chemical_list: D008727:Methotrexate