1. Dermatology Service; Mostoles University Hospital; Madrid Spain
2. Department of Biology; Faculty of Sciences; Autonomous University of Madrid; Madrid Spain
3. Pathology Service; Puerta de Hierro University Hospital; Madrid Spain
4. Dermatology Department; Brigham and Women′s Hospital; Harvard Medical School; Boston MA USA
5. Dermatology Service; San Jorge Hospital; Huesca Spain
6. Department of Medicine and Medical Specialities; Alcalá University; Madrid Spain
7. Dermatology Service; Memorial Sloan-Kettering Cancer Center; New York NY USA