title: Letter: Diet and geographical distribution of multiple sclerosis.
mesh_terms: D000293:Adolescent; D000328:Adult; D000818:Animals; D002675:Child, Preschool; D004032:Diet / Q000009:adverse effects*; D004641:Emigration and Immigration; D004781:Environmental Exposure; D006801:Humans; D006920:Hygiene; D008892:Milk / Q000009:adverse effects; D009103:Multiple Sclerosis / Q000453:epidemiology* / Q000209:etiology; D013019:South Africa