Multiple sclerosis in twins and other relatives.
D004200:Diseases in Twins; D005260:Female; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D008297:Male; D008459:Measles virus / Q000276:immunology; D009103:Multiple Sclerosis / Q000175:diagnosis / Q000453:epidemiology / Q000235:genetics*; D011044:Poland