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Juvenile Idiopathic Arthritis (JIA) is the most chronic musculoskeletal disease of pediatric population. Its incidence and prevalence vary considerably throught the world. The Spanish Society of Rheumatology has estimated a incidence and prevalence of 8-22/100.000 and 0.7-40/100.000 respectively.

Juvenile idiopathic arthritis: cross-sectional study of incidence and prevalence observed in a tertiary center of spain