1. Department of Dermatology Hospital de la Santa Creu i Sant Pau Barcelona Spain
2. Department of Dermatology Hospital Universitario Marqués de Valdecilla Santander Spain
3. Deparment of Dermatology Hospital Universitario Central de Asturias Oviedo Spain
4. Department of Dermatology Hospital Universitario de Gran Canaria Doctor Negrin Las Palmas de Gran Canaria Spain
5. Department of Dermatology Hospital Universitario y Politécnico La Fe de Valencia Spain
6. Department of Dermatology Complexo Hospitalario Universitario de Pontevedra Pontevedra Spain
7. Department of Dermatology Hospital Germans Trias i Pujol, Badalona Barcelona Spain
8. Department of Dermatology Hospital Universitario Ramon y Cajal Madrid Spain
9. Department of Dermatology Hospital de Manises Manises Spain
10. Department of Dermatology Hospital 12 de Octubre Madrid Spain
11. Department of Dermatology Complejo Hospitalario de Navarra Pamplona Spain
12. Department of Dermatology Hospital Universitario Doctor Peset Valencia Spain
13. Department of Dermatology Hospital General Universitario de Alicante Alicante Spain
14. Department of Dermatology Hospital la Princesa Madrid Spain
15. Department of Dermatology Hospital Clínic de Barcelona Barcelona Spain
16. Department of Dermatology Hospital Universitari Sagrat Cor Barcelona Spain
17. Department of Dermatology Hospital Universitario Fundación Alcorcón Alcorcón Spain
18. Department of Epidemiology Hospital de la Santa Creu i Sant Pau Barcelona Spain