1. Department of Otorhinolaryngology University Hospital Essen, University Duisburg‐Essen Essen Germany
2. Skin Cancer Unit of the Dermatology Department, Medical Faculty University Duisburg‐Essen, West German Cancer Center Essen Germany
3. Institute for Immunology University Hospital Essen, University of Duisburg‐Essen Essen Germany
4. German Cancer Consortium (DKTK) partner site Essen/Düsseldorf Essen Germany
5. Department of Dermatology and Allergology, University Hospital, Ludwig Maximilian University Munich Germany