1. Department of Radiotherapy and Oncology; Goethe-University; Frankfurt am Main Germany
2. Institute of Virology, National Reference Centre for Papilloma- and Polyomaviruses, University of Cologne; Cologne Germany
3. Department of Pathology; University Medical Center Göttingen; Göttingen Germany
4. Department of Radiotherapy and Radiation Oncology; University Medical Center Göttingen; Göttingen Germany
5. Department of Pathology and STRATIFYER Molecular Pathology GmbH; St. Elisabeth Krankenhaus; Cologne Germany