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Competing interests: None.
Funding: This research was funded by The Health and Medical Care Executive Board of the Västra Götaland, Rune och Ulla Amlövs foundation for Rheumatology Research, Göteborg’s Association Against Rheumatism, Reumaforskningsfond Margareta, The Medical Society of Göteborg, the Medical Faculty of Göteborg (LUA) and Finska Läkaresällskapet, HUS TYH 2235 evo grant, Invalid Foundation, the Finnish Dental Society Apollonia, CIMO and Helsinki University.
Ethics approval: Patients gave informed written consent and the study was approved by the local Ethics Committee.
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