1. Department of Dermatology, Hospital Universitari Germans Trias i Pujol, 08916 Badalona, Spain
2. Departament de Medicina, Universitat Autònoma de Barcelona, 08035 Barcelona, Spain
3. Department of Dermatology, Hospital Clínic de Barcelona, Universitat de Barcelona, 08036 Barcelona, Spain
4. Department of Dermatology, Hospital Universitari Vall d’Hebron, 08035 Barcelona, Spain