1. Department of Clinical Epidemiology Aarhus University Hospital P.P. Ørumsgade 11 Aarhus C 8000 Denmark
2. Department of Dermatology Roskilde Hospital Health Sciences Faculty University of Copenhagen Roskilde Denmark
3. Department of Dermatology Aarhus University Hospital P.P. Ørumsgade 11 Aarhus C 8000 Denmark