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 Pathology, Mülheim an der Ruhr Mülheim Germany
4. Institute of Virology, Faculty of Medicine and University Hospital Cologne University of Cologne Cologne Germany