[1] Univ Manchester, Ctr Epidemiol Versus Arthrit, Ctr Musculoskeletal Res, Fac Biol Med & Hlth, Manchester, Lancs, England
[2] Manchester Univ NHS Fdn Trust, NIHR Manchester Biomed Res Ctr, Manchester, Lancs, England
[3] Manchester Univ NHS Fdn Trust, Royal Manchester Childrens Hosp, Dept Paediat & Adolescent Rheumatol, Manchester, Lancs, England
[4] Childrens Mercy Kansas City, Div Dev & Behav Sci, Psychol Sect, Kansas City, KS USA
[5] Univ Manchester, Div Psychol & Mental Hlth, Manchester Ctr Hlth Psychol, Manchester, Lancs, England
[6] Univ Manchester, Div Musculoskeletal & Dermatol Sci, Fac Biol Med & Hlth, Manchester, Lancs, England