1. Department of Dermatology Venereology and Allergology University Hospital Würzburg Josef‐Schneider‐Strasse 2 Würzburg 97080 Germany
2. Comprehensive Cancer Center Mainfranken University Hospital Würzburg Josef‐Schneider‐Strasse 6 Würzburg 97080 Germany
3. Institute for Clinical Epidemiology and Biometry University of Würzburg Josef‐Schneider‐Straße 2 Würzburg 97080 Germany