1. Department of Dermatology, Venereology, and Allergology University Medical Center Göttingen Germany
2. Department of Dermatology University Medical Center Mannheim Mannheim Germany
3. Department of Dermatology University Hospital Frankfurt Frankfurt am Main Germany
4. Psoriasis‐Center, Department of Dermatology University Hospital Schleswig‐Holstein Kiel Germany
5. Mannheim Institute of Public Health, Medical Faculty Mannheim, University of Heidelberg Mannheim Germany
6. Department of Dermatology and Allergy University Bonn Bonn Germany