1. Department of Dermatology and Venereology, Institute of Clinical Sciences, Sahlgrenska Academy University of Gothenburg Gothenburg Sweden
2. Department of Dermatology and Venereology, Region Västra Götaland Sahlgrenska University Hospital Gothenburg Sweden
3. Department of Dermatology Medical University of Vienna Vienna Austria
4. Center of Medical Statistics, Informatics and Intelligent Systems (CeMSIIS) Medical University of Vienna Vienna Austria