1. Department of Applied Tumor Biology; Institute of Pathology, University of Heidelberg, and Clinical Cooperation Unit Applied Tumor Biology, German Cancer Research Center (DKFZ); Heidelberg Germany
2. Institute of Pathology, University of Heidelberg, and National Center for Tumor Diseases (NCT) Tissue Bank; Heidelberg Germany
3. Department of Otorhinolaryngology; Head and Neck Surgery, University of Heidelberg; Heidelberg Germany
4. Department of Otorhinolaryngology; Head and Neck Surgery, University of Giessen; Giessen Germany
5. Department of Oral and Maxillofacial Surgery; University of Heidelberg; Heidelberg Germany