1. Department of Medical, Surgical and Health Sciences, Section of Otolaryngology University of Trieste Trieste Italy
2. Department of Medical, Surgical and Experimental Sciences University of Sassari Sassari Italy
3. Guy's and St Thomas’ Hospitals London UK
4. Department of Medical, Surgical and Experimental Sciences, Infectious Disease Unit University of Sassari Sassari Italy
5. Department of Prevention, Section of Hygiene and Public Health Azienda Sanitaria Universitaria Giuliano Isontina (ASUGI) Trieste Italy
6. Department of ENT, Addenbrooke's Hospital Cambridge University Hospitals Cambridge UK
7. Department of Otolaryngology‐Head Neck Surgery Elsan Hospital Paris France
8. Unit of Cancer Epidemiology Centro di Riferimento Oncologico di Aviano (CRO) Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Aviano Italy
9. Department of Medical, Surgical and Experimental Sciences, Maxillofacial Surgery Operative Unit University of Sassari Sassari Italy
10. PhD School of Biomedical Sciences, Department of Biomedical Sciences University of Sassari Sassari Italy