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acute arthritis
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acute rheumatic fever
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juvenile idiopathic arthritis (oligoarthritis, polyarthritis, psoriatic arthritis, enthesitis related arthritis)
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systemic vasculitis (Henoch Schonlein vasculitis, erythema nodosum, polyarteritis nodosa, Behcet’s disease)
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connective tissue disorders (systemic lupus erythematosus, juvenile dermatomyositis, systemic and localized scleroderma)
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chronic recurrent multifocal osteomyelitis