1. Department of Radiation Oncology University Hospital of Muenster Munster Germany
2. Department of Dermatology and Venerology Martin‐Luther‐University Halle‐Wittenberg Halle Germany
3. Department of Dermatology University Hospital of Muenster Munster Germany
4. Department of Dermatology University Hospital of Bochum Bochum Germany
5. Department of Dermatology University Hospital of Essen Essen Germany
6. Department of Dermatology Johannes Wesling Medical Centre University of Bochum Minden German