Fig. 2From: Smoking, Porphyromonas gingivalis and the immune response to citrullinated autoantigens before the clinical onset of rheumatoid arthritis in a Southern European nested case–control studyAntibodies to RgpB in pre-RA subjects versus matched controls according to smoking status defined as never, former or current. * p < 0.05; *** I < 0.001; **** p < 0.0001Back to article page