1. Department of ENT/Head and Neck Surgery Queen Elizabeth University Hospital Birmingham Birmingham UK
2. Unit of Cancer Epidemiology Centro di Riferimento Oncologico di Aviano (CRO) IRCCS Aviano Italy
3. ENT Clinic, Head and Neck Department Azienda Sanitaria Universitaria Integrata di Trieste Trieste Italy
4. Department of Neurosciences, Section of Otolaryngology University of Padova Treviso Italy
5. Department of Radiation Oncology Treviso Regional Hospital Treviso Italy
6. Institue of Cancer and Genomic Sciences University of Birmingham Birmingham UK