1. Department of Dermatology University Hospital Muenster Muenster Germany
2. Department of Dermatology Medical Faculty Heinrich‐Heine University Duesseldorf Germany
3. Institute of Virology National Reference Center for Papilloma and Polyomaviruses University of Cologne Cologne Germany
4. Center for Molecular Biology of Inflammation Institute of Medical Biochemistry University of Muenster Muenster Germany
5. Department of Dermatology, Allergology, und Dermatosurgery HELIOS University Hospital Wuppertal University of Witten‐Herdecke Wuppertal Germany
6. Department of Dermatology and Venereology HELIOS Hospital Krefeld Krefeld Germany
7. Institute of Pathology Mülheim a.d.R. Germany
8. Clinic and Policlinic for Dermatology and Venereology University Medical Center Rostock Rostock Germany
9. Department of Dermatology Christian‐Albrechts‐UniversityUniversity Medical Center Schleswig‐Holstein Kiel Germany
10. Department of Dermatology, Venereology, and Allergology HELIOS St. Elisabeth Hospital Oberhausen University of Witten‐Herdecke Oberhausen Germany