[1] Alan Lyell Ctr Dermatol, Glasgow, Lanark, Scotland
[2] Univ Glasgow, Dermatol Sect, Div Canc Sci & Mol Pathol, Glasgow G12 8QQ, Lanark, Scotland
[3] Univ Dundee, Epithelial Genet Grp, Human Genet Unit, Dundee, Scotland
[4] Univ Glasgow, Sect Infect & Immunol, Glasgow G12 8QQ, Lanark, Scotland
[5] St Thomas Hosp, St Johns Inst Dermatol, London, England