Inmaculada Del Rincón et al.
Arthritis and rheumatism, 49(2), 200-208 (2003-04-11)
To assess the extent of ethnic variation in the clinical expression of rheumatoid arthritis (RA) and the role of HLA-DRB1 alleles in this variation. We assessed consecutive RA patients for joint findings, subcutaneous nodules, laboratory and radiographic findings, and treatment.