1. Institute of Pathology; University Medical Center Hamburg-Eppendorf; Hamburg Germany
2. Department of Oncology, Haematology, Bone Marrow Transplantation and Section Pneumology; Hubertus-Wald-Cancer-Center; University Medical Center Hamburg-Eppendorf; Hamburg Germany
3. Department of Otolaryngology, Head and Neck Surgery; University Medical Center Hamburg-Eppendorf; Hamburg Germany