[1] Oxford Univ Hosp NHS FT, Dept Rheumatol, Windmill Rd, Oxford OX3 7LD, England
[2] Univ Oxford, Nuffield Dept Orthopaed Rheumatol & Musculoskelet, Windmill Rd, Oxford OX3 7HE, England
[3] Univ Sheffield, Fac Med Dent & Hlth, Beech Hill Rd, Sheffield S10 2RX, S Yorkshire, England
[4] Barnsley Hosp NHS Fdn Trust, Gawber Rd, Barnsley S75 2EP, S Yorkshire, England