1. Department of Dermatology; Hospital Universitario Fundación Alcorcón; Madrid Spain
2. Research Unit; Fundación Academia Española de Dermatología y Venereología; Madrid Spain
3. Research Unit; Complejo Hospitalario Universitario de Albacete; Albacete Spain
4. Department of Dermatology; Hospital General Universitario de Alicante; Alicante Spain
5. Department of Dermatology; Hospital Universitario Germans Trias i Pujol, Universitat Autónoma de Barcelona; Badalona, Barcelona Spain
6. Department of Dermatology; Hospital del Mar, Parc de Salut Mar; Barcelona Spain
7. Department of Dermatology; Hospital Universitario 12 de Octubre; Madrid Spain
8. Department of Dermatology; Hospital Universitario Reina Sofía; Córdoba Spain
9. Department of Dermatology; Complexo Hospitalario Universitario de Vigo; Vigo Spain