1. Research Unit; Fundación Piel Sana AEDV Madrid; Ferraz 100, 1° izda 28008 Madrid Spain
2. Department of Dermatology; Complexo Hospitalario Universitario de Vigo; Meixoeiro sn 36200 Vigo Spain
3. Department of Dermatology; Erasmus Medical Centre; PO Box 2040 3000 CA Rotterdam the Netherlands