A multicenter study methodologic experience from a multicenter case-control study in Italy. The Italian Multiple Sclerosis Study Group.
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D016022:Case-Control Studies; D006801:Humans; D007558:Italy; D008959:Models, Neurological; D015337:Multicenter Studies as Topic / Q000379:methods; D009103:Multiple Sclerosis / Q000453:epidemiology / Q000209:etiology*; D012016:Reference Values; D012107:Research Design; D012307:Risk Factors