title: Letter: Environmental carbon monoxide and multiple sclerosis.
mesh_terms: D000397:Air Pollution; D002248:Carbon Monoxide / Q000633:toxicity*; D004781:Environmental Exposure; D006801:Humans; D009103:Multiple Sclerosis / Q000209:etiology*; D011736:Pyridoxine
chemical_list: D002248:Carbon Monoxide; D011736:Pyridoxine