1. Department of Histopathology, University Hospital El Bierzo, Ponferrada, Spain;
2. Department of Cellular Pathology, Hospital de la Reina, Ponferrada, Spain;
3. Research Department, Institute for Biomedical Research of A Coruña (INIBIC), University of A Coruña (UDC), A Coruña, Spain;
4. Department of Dermatology, Hospital Universitario de Navarra, Pamplona, Spain;
5. Department of Pathology, Complejo Asistencial Universitario de Leon; and
6. Department of Dermatology, Serveis Mèdics Penedès, Vilanova i la Geltrú, Barcelona, Spain.