1. Department of Dermatology; University Hospital Schleswig-Holstein (UKSH); Campus Kiel Germany
2. Department of Dermatology; Tübingen University Hospital; Germany
3. Department of Dermatology; Frankfurt University Hospital; Germany
4. Department of Radiation Therapy and Radio-oncology; Leipzig Germany
5. Fachklinik Hornheide, Division of Oral and Maxillofacial Surgery; Plastic and Aesthetic Surgery; Münster Germany
6. Department of Otolaryngology; Marburg University Hospital; Germany
7. Department of Dermatology; Düsseldorf University Hospital; Germany
8. Dermatology Practice; Düsseldorf; Germany