1. Department of Oral, Maxillofacial and Plastic Surgery; University Medical Centre of Rostock; Rostock Germany
2. Department of Oral, Maxillofacial and Plastic Surgery; University Medical Centre of the Johannes Gutenberg University Mainz; Mainz Germany
3. Department of Otorhinolaryngology, Head and Neck Surgery; University Medical Centre of the Johannes Gutenberg University Mainz; Mainz Germany
4. Department of Otorhinolaryngology, Head and Neck Surgery; Molecular Tumor Biology Laboratory; University Medical Centre of the Johannes Gutenberg University Mainz; Mainz Germany