1. Dermatology Service, Hospital Universitario Puerta del Mar , Cadiz , Spain
2. Dermatology Service, Clinica Dermatologica Dr Garcia Dorado , Salamanca , Spain
3. Department of Pathology, Hospital Universitario de Salamanca , Salamanca , Spain
4. Department of Pathology, Complejo Hospitalario Universitario de Vigo , Pontevedra , Spain
5. Department of Pathology, Hospital Universitario Lozano Blesa , Zaragoza , Spain
6. Dermatology Service, Hospital Universitario de Salamanca , Salamanca , Spain