1. Department of Dermatology; Hospital Universitario de Cabueñes; Gijón Spain
2. Department of Dermatology; Freiburg University Medical Center; Freiburg Germany
3. Department of Pathology; Hospital Universitario de Cabueñes; Gijón Spain
4. Molecular Medicine Unit; Department of Medicine; Facultad de Medicina de Salamanca; Salamanca Spain
5. Department of Dermatology; Hospital Infantil del Niño Jesús; Madrid Spain