[1] Royal United Hosp, Royal Natl Hosp Rheumat Dis, Bath, Avon, England
[2] Univ Bath, Dept Life Sci, Bath, Avon, England
[3] Univ Bath, Dept Math Sci, Bath, Avon, England
[4] Sanjay Gandhi Postgrad Inst Med Sci, Dept Clin Immunol & Rheumatol, Lucknow, Uttar Pradesh, India
[5] Royal Wolverhampton Hosp NHS Trust, Dept Rheumatol, Wolverhampton, England
[6] Sandwell & West Birmingham Hosp, City Hosp, Dept Rheumatol, Birmingham, W Midlands, England
[7] Univ Manchester, Sch Biol Sci, Div Musculoskeletal & Dermatol Sci, Ctr Musculoskeletal Res, Manchester, Lancs, England