1. Department of Medical, Surgical and Health Sciences, Section of Otolaryngology University of Trieste Trieste Italy
2. Unit of Cancer Epidemiology Centro di Riferimento Oncologico di Aviano (CRO) IRCCS Aviano Italy
3. Department of Neurosciences, Section of Otolaryngology Papa Giovanni XXIII General Hospital Bergamo Italy
4. Department of ENT, Addenbrooke's Hospital Cambridge University Hospitals NHS Foundation Trust Cambridge UK
5. Department of Cardiovascular, Neural and Metabolic Sciences Istituto Auxologico Italiano IRCCS, Ospedale San Luca Milano Italy