1. Skin Cancer Center Department of Dermatology Ruhr‐University Bochum Bochum Germany
2. Department of Internal Medicine Ruhr‐University Bochum Bochum Germany
3. Translational Skin Cancer Research DKTK Partner Site Essen/Düsseldorf West German Cancer Center Dermatology University Duisburg‐Essen Essen Germany
4. German Cancer Research Center (DKFZ) Heidelberg Germany