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Author details Public Health and Clinical Medicine/Rheumatology, Umeå University, Umeå, Sweden. Department of Medicine Solna, Rheumatology Unit, Karolinska Institutet, Stockholm, Sweden. Department of Oral Immunology and Infectious Diseases, University of Louisville, School of Dentistry, Louisville, KY, USA. Department of Microbiology, and Malopolska Centre of Biotechnology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland.

Erratum to: Concentration of antibodies against Porphyromonas gingivalisis increased before the onset of symptoms of rheumatoid arthritis