we studied the distribution and characteristics of circulating rheumatoid factors ( rf ) and anti-nuclear antibodies ( ana ) in 30 rheumatoid arthritis ( ra ) patients who had polyarthritis alone ( group i ) , 28 ra patients with polyarthritis and extra-articular disease ( group ii ) , 28 ra patients with systemic vasculitis ( group iii ) and 60 healthy matched controls .
C0022408
articular disease
C0003864
ra