Hajeer, A H Influence of previous exposure to human parvovirus B19 infection in explaining susceptibility to rheumatoid arthritis: an analysis of disease discordant twin pairs. [electronic resource] - Annals of the rheumatic diseases Feb 1994 - 137-9 p. digital Publication Type: Comparative Study; Journal Article ISSN: 0003-4967 Standard No.: 10.1136/ard.53.2.137 doi Subjects--Topical Terms: Antibodies, Viral--analysisArthritis, Rheumatoid--complicationsDisease SusceptibilityDiseases in TwinsErythema Infectiosum--complicationsFemaleHumansMaleMiddle AgedOdds RatioParvovirus B19, Human--immunologyRisk FactorsSex FactorsTwins, DizygoticTwins, Monozygotic