[1] Queens Univ Belfast, Sch Med Dent & Biomed Sci, Univ Rd, Belfast BT7 1NN, Antrim, North Ireland
[2] Harrogate & Dist NHS Fdn Trust, Dermatol Dept, Harrogate, England
[3] Trinity Coll Dublin, Trinity Biomed Sci Inst, Sch Med, Dublin, Ireland
[4] Univ Birmingham, Birmingham Med Sch, Coll Med & Dent Sci, Birmingham, England
[5] Kings Coll London, Henriette Raphael House,Guys Campus, London, England
[6] Guys & St Thomas NHS Fdn Trust, St Johns Inst Dermatol, London, England