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Wakefield, R.J., Green, M.J., Marzo-Ortega, H. et al. (5 more authors) (2004) Should oligoarthritis be reclassified? Ultrasound reveals a high prevalence of subclinical disease. Annals of the Rheumatic Diseases, 63 (Suppl ). pp. 382-385. ISSN 0003-4967