| http://www.w3.org/ns/prov#value | - Systemic onset JRA (also called Still's disease) is the most serious, but least common form of the disease, affecting 10 to 15 percent of children with JRA. It affects one or more joints and causes inflammation of internal organs, including the heart, liver, spleen, and lymph nodes.What causes juvenile rheumatoid arthritis?Like adult rheumatoid arthritis, JRA is an autoimmune disease, which means
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