[1] Peninsula Med Sch, Inst Clin & Med Sci, Exeter EX1 2LU, Devon, England
[2] Torbay Hosp, S Devon Hlth Care NHS Trust, Torquay, England
[3] UCL, Dept Rheumatol Res, London, England
[4] Univ London, Barts & London, Bone & Joint Res Unit, London, England