1. Department of Dermatology Venereology, and Allergology Helios St. Elisabeth Hospital Oberhausen University Witten‐Herdecke Oberhausen Germany
2. Department of Dermatology Venereology and Allergology Helios St. Johannes Hospital Duisburg Duisburg Germany
3. Institute of Virology University of Cologne Faculty of Medicine and University Hospital Cologne Cologne Germany