1. Department of ENT, Addenbrooke's Hospital, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK
2. Unit of Cancer Epidemiology, Centro di Riferimento Oncologico di Aviano (CRO) IRCCS, Aviano, Italy
3. Department of Otorhinolaryngology - Head and Neck Surgery, University of Brescia, Brescia, Italy
4. Department of Medical Oncology, Medical Oncology Unit, ASST Spedali Civili di Brescia, Brescia, Italy
5. Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, Section of Ear Nose and Throat (ENT), University of Verona, Verona, Italy
6. Department of Medical Surgical and Health Sciences, Section of Otolaryngology, University of Trieste, Trieste, Italy
7. ENT Department, University Hospital of Ferrara, Ferrara, Italy
8. Department of Otorhinolaryngology, University of Pavia, IRCCS Policlinico ‘San Matteo’ Foundation, Pavia, Italy
9. Unit of Otolaryngology, Azienda Ospedaliera ‘S. Maria degli Angeli’, Pordenone, Italy
10. Department of Neurosciences, Section of Otolaryngology, University of Padova, Padova, Italy
11. Department of Neurosciences, Section of Otolaryngology, University of Padova, Treviso, Italy
12. Department of ENT, New Cross Hospital, Wolverhampton, UK