1. Department of Oncology and Hematology with Sections Bone Marrow Transplant and Pneumology, Hubertus Wald Tumorzentrum / University Cancer Center Hamburg, University Medical Center Hamburg, Hamburg, Germany
2. Department of Otorhinolaryngology, Head and Neck Cancer Center of The University Cancer Center Hamburg, University Medical Center Hamburg, Hamburg, Germany
3. Department of Otorhinolaryngology and Head and Neck Surgery, Ulm University Medical Center, Ulm, Germany
4. Department of Pathology, University Medical Center Hamburg, Hamburg, Germany
5. Laboratory for Radiobiology and Experimental Radiooncology, Head and Neck Cancer Center of The University Cancer Center Hamburg, University Medical Center Hamburg, Hamburg, Germany