?:definition
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rheumatoid arthritis of children occurring in three major subtypes defined by the symptoms present during the first six months following onset: systemic onset (Still\'s Disease, Juvenile Onset), polyarticular onset, and pauciarticular onset; adult onset cases of Still\'s disease (Still\'s Disease, adult onset) are also known; only one subtype of juvenile rheumatoid arthritis (polyarticular onset, rheumatoid factor positive) clinically resembles adult rheumatoid arthritis and is considered its childhood equivalent.
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