1 Dermatology Department, Centro Hospitalar Universitário do Porto, Porto, Portugal
2 Department of Dermatology. Hospital General Universitario Gregorio Mara˜nón, Madrid, Spain
3 CIRI, Centre International de Recherche en Infectiologie, (Team Epidermal Immunity and Allergy); INSERM, U1111; Univ Lyon; Université de Lyon 1; Ecole Normale Supérieure de Lyon; CNRS, UMR 5308, Lyon, France Department of Dermatology and allergology, Centre Hospitalier Universitaire de Saint-Etienne, Saint-Priest-en-Jarez, France
4 Dermatology Department, Addenbrookes Hospital, Cambridge, Cambridge University Hospitals NHS Trust, UK
5 Department of Dermatology, Venereology and Allergology, University Hospital Würzburg, Würzburg, Germany