1. Research Unit; Fundación Piel Sana AEDV Madrid; Ferraz 100, 1° izda 28008 Madrid Spain
2. Department of Dermatology; Complexo Hospitalario Universitario de Vigo, Vigo; Meixoeiro sn 36200 Vigo Spain
3. Division of Dermatology; Department of Medicine; J.H. Stroger Jr Hospital of Cook County; 1900 West Polk Street Chicago IL 60612 U.S.A.
4. Unit for Population-Based Dermatology Research; St John's Institute of Dermatology; Guy's and St Thomas’ NHS Foundation Trust and King's College London; London U.K.
5. Centre of Evidence Based Dermatology; King's Meadow Campus; University of Nottingham; Nottingham U.K.
6. Department of Dermatology & Wound Healing; Division of Infection and Immunity; Cardiff University; University Hospital of Wales; 3rd Floor Glamorgan House, Heath Park Cardiff CF14 4XN U.K.