[1] Univ Oxford, Inst Musculoskeletal Sci, Botnar Res Ctr, Oxford OX3 7LD, England
[2] Univ Queensland, Diamantina Inst Canc Immunol & Metab Med, Brisbane, Qld, Australia
[3] Rheumatism Fdn Hosp, SF-18120 Heinola, Finland
[4] Univ Tampere, Sch Med, Dept Musculoskeletal Med, FIN-33101 Tampere, Finland
[5] Univ Helsinki, Natl Publ Hlth Inst, Helsinki, Finland
[6] S Ostrobothnia Cent Hosp, Seinajoki, Finland
[7] Univ Oxford, Inst Musculoskeletal Med, Oxford OX1 2JD, England