title: [How does periodontitis have an impact on RA].
mesh_terms: D001172:Arthritis, Rheumatoid / Q000453:epidemiology*; D015984:Causality; D015897:Comorbidity; D019317:Evidence-Based Medicine; D006801:Humans; D015994:Incidence; D009909:Oral Health / Q000706:statistics & numerical data*; D010518:Periodontitis / Q000453:epidemiology*; D012307:Risk Factors