[1] Univ Leeds, Leeds Inst Rheumat & Musculoskeletal Med, Leeds, W Yorkshire, England
[2] Natl Inst Hlth Res, Leeds Musculoskeletal Biomed Res Unit, Leeds, W Yorkshire, England
[3] Leeds Teaching Hosp NHS Trust, Leeds Ctr Dermatol, Dept Dermatol, Leeds, W Yorkshire, England