[1] Univ Leeds, Rheumatol & Rehabil Res Unit, Leeds LS2 9NZ, W Yorkshire, England
[2] UMDS, Guys Hosp, Dept Rheumatol, London SE1 9RT, England
[3] Univ Wales, Dept Rheumatol, Cardiff CF1 3NS, S Glam, Wales
[4] Glasgow Royal Infirm, Univ Dept Med, Glasgow, Lanark, Scotland