1. Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy.
2. Department of Specialist Surgical Sciences, Otolaryngology Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy.
3. Department of Specialist Surgical Sciences, Audiology Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy.
4. Department of Mental and Physical Health and Preventive Medicine, “L. Vanvitelli” University, Naples, Italy.
5. Epidemiology Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy.