1. Department of Otorhinolaryngology, Head Neck SurgeryMedical University of Vienna Vienna Austria
2. Clinical PathologyMedical University of Vienna Vienna Austria
3. RadiotherapyMedical University of Vienna Vienna Austria
4. Department of Oral and Maxillofacial SurgeryDental School of AthensUniversity of Athens Athens Greece
5. Institute of Head and Neck DiseasesEvangelical Hospital Vienna Vienna Austria