1. Institute of Pathology, University Hospital of Cologne, Cologne, Germany
2. Department of Pathology, University of Halle, Halle, Germany
3. Center for Molecular Medicine, University of Cologne, Cologne, Germany
4. Center of Integrative Oncology, University Hospital of Cologne, Cologne, Germany
5. Department of Pathology, University Hospital of Münster, Münster, Germany
6. Department of Otorhinolaryngology, Head and Neck Surgery, University of Cologne, Cologne, Germany
7. Department of Otorhinolaryngology, Head and Neck Surgery, University Medical Center Göttingen, Göttingen, Germany
8. Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Essen, University Duisburg-Essen, Duisburg, Germany