Adult 1 Arthritis, Rheumatoid 1 Article 1 Biomarkers 1 C reactive protein 1 Case-Control Studies 1 Cross-Sectional Studies 1 DAS28 1 Female 1 Health Assessment Questionnaire 1 Health Assessment Questionnaire Disability Index 1 Humans 1 IL-17A 1 IL-23 IL17A protein, human 1 IL17RA protein, human 1 IL23A protein, human 1 IL23R protein, human 1 Interleukin-17 1 Interleukin-23 Subunit p19 1 Male 1 Periodontitis 1 Prognosis 1 Receptors, Interleukin 1 Receptors, Interleukin-17 1 adult 1 biological marker 1 blood 1 blood sampling 1 case control study 1