[1] Royal Victoria Infirm, Dept Dermatol, Newcastle Upon Tyne, England
[2] Univ Nottingham, Dept Dermatol, Nottingham, England
[3] Norfolk & Norwich Univ Hosp NHS Trust, Dept Dermatol, Norwich, England
[4] Univ Southampton, Dept Dermatol, Fac Med, Southampton, England
[5] Univ Aberdeen, Aberdeen, Scotland
[6] Newcastle Tyne Hosp NHS Trust, Dept Dermatol, Newcastle Upon Tyne, England