1. Department of Otorhinolaryngology, Head and Neck Surgery, Medical Faculty, University of Giessen, 35392 Giessen, Germany
2. Department of Otorhinolaryngology, Head and Neck Surgery, Medical Faculty, University of Cologne, 50937 Cologne, Germany
3. Medical Statistics, Institute of Medical Informatics, University of Giessen, 35392 Giessen, Germany
4. Department of Applied Tumor Biology, Institute of Pathology, University Hospital Heidelberg, 69120 Heidelberg, Germany
5. Clinical Cooperation Unit Applied Tumor Biology, German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
6. Institute of Pathology, University of Giessen, 35392 Giessen, Germany
7. Infections and Cancer Epidemiology, Infection, Inflammation and Cancer Program, German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
8. Department of Otorhinolaryngology, Klinikum Dortmund gGmbH, University Hospital Witten/Herdecke, 44137 Dortmund, Germany