1. Bispebjerg Hospital; Department of Dermatology; Bispebjerg Bakke 23 Copenhagen Denmark 2400 NV
2. University Hospital of Aarhus; Department of Dermatology; P.P Orumsgade 11 Aarhus Denmark DK-8000 C
3. The University of Nottingham; Division of Epidemiology and Public Health; Clinical Sciences Building Nottingham City Hospital NHS Trust Campus, Hucknall Road Nottingham UK NG5 1PB