AGBL2 and rheumatoid arthritis: Antibodies against P. gingivalis and P. intermedia, anti-P. gingivalis and anti-Escherichia coli LPS-specific antibodies;laboratory variables: CCP2, RF, HLA-B27;clinical RA assessment: DAS28, TJC, SJC, disease duration, patient’s global assessment of disease activity, wrist X-raysclinical response to infliximab