High prevalence of IgA rheumatoid factor in severe polyarticular-onset juvenile rheumatoid arthritis, but not in systemic-onset or pauciarticular-onset disease.
Arthritis Rheum. 1990 Feb;33(2):199-204. doi: 10.1002/art.1780330207.
Arthritis Rheum. 1990.
PMID: 2306290