Juvenile idiopathic arthritis (JIA) is one of the most common rheumatic diseases in childhood. Estimates of the number of children affected at any one time vary greatly, ranging between 16 to 150 per 100,000 children. JIA has been known by different names over the years. Previously, juvenile rheumatoid arthritis and juvenile chronic arthritis were terms that were used to describe this broad class of diseases. It is an...
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