title: Multiple sclerosis in Transylvania: a zone of transition in frequency.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000531:Altitude; D002980:Climate; D005260:Female; D006268:Health Facilities; D006801:Humans; D006814:Hungary; D007855:Lead Poisoning / Q000150:complications; D008297:Male; D008875:Middle Aged; D009103:Multiple Sclerosis / Q000453:epidemiology* / Q000209:etiology / Q000235:genetics / Q000401:mortality; D012383:Romania; D012424:Rural Population; D012737:Sex Factors; D014505:Urban Population