[1] Chapel Allerton Hosp, Leeds Teaching Hosp NHS Trust, Dept Dermatol, Leeds LS7 4SA, W Yorkshire, England
[2] Univ Nottingham, Fac Med & Hlth Sci, Nottingham NG7 2RD, England
[3] Univ Leeds, Leeds Inst Rheumat & Musculoskeletal Med, Leeds, W Yorkshire, England
[4] So Gen Hosp, Alan Lyell Ctr Dermatol, Glasgow G51 4TF, Lanark, Scotland
[5] Nottingham NHS Treatment Ctr, Nottingham, England
[6] Univ Glasgow, Coll Med Vet & Life Sci, Inst Infect Immun & Inflammat, Glasgow, Lanark, Scotland
[7] Cardiff Univ, Inst Infect & Immun, Dept Dermatol & Wound Healing, Cardiff CF10 3AX, S Glam, Wales