[1] Aintree Univ Hosp NHS Fdn Trust, Dept Rheumatol, Liverpool L9 7AL, Merseyside, England
[2] Univ Liverpool, Inst Ageing & Chron Dis, Musculoskeletal Biol 1, Liverpool L69 3BX, Merseyside, England
[3] Keele Univ, Res Inst Primary Care & Hlth Sci, Keele ST5 5BG, Staffs, England
[4] Kings Coll London, Psychol Med Clin Acad Grp, London WC2R 2LS, England
[5] Kings Coll London, Acad Dept Rheumatol, London WC2R 2LS, England