[Epidemiologic studies of rheumatoid factor among the rural population of Bulgaria].
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002031:Bulgaria; D006306:Health Surveys; D006801:Humans; D008875:Middle Aged; D012217:Rheumatoid Factor / Q000032:analysis*; D012423:Rural Health
D012217:Rheumatoid Factor
Epidemiologieheskie issledovaniia revmatoidnogo faktora sredi sel'skogo naseleniia Bolgarii.