title: The prevalence of multiple sclerosis in 3 US communities: the role of vitamin D.
authors.forename: William B
authors.initials: WB
authors.lastname: Grant
mesh_terms: D005843:Geography; D006801:Humans; D009103:Multiple Sclerosis / Q000453:epidemiology* / Q000209:etiology; D015995:Prevalence; D014466:Ultraviolet Rays; D014481:United States / Q000453:epidemiology; D014808:Vitamin D Deficiency / Q000150:complications / Q000453:epidemiology*