Sibship size does not increase the risk of developing rheumatoid arthritis.

Abstract

Although the cause of rheumatoid arthritis (RA) is unknown, one hypothesis is that an infectious episode may trigger the disease and this may occur in childhood. Observational studies performed at least 25 years ago have suggested that the incidence of RA is increased in individuals from large families. We therefore tested this hypothesis using data from a… (More)

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