1. Audiology Unit, Dept of Clinical Sciences and Community Health, University of Milan, Milan, Italy;
2. Department of Specialist Surgical Sciences, Fondazione IRCCS Cà Granda, Ospedale Maggiore Policlinico, University of Milano, Milan, Italy;
3. Department of Neuroradiology, Fondazione IRCCS Cà Granda, Ospedale Maggiore Policlinico, University of Milano, Milan, Italy;
4. Laboratory of Medical Statistics, Biometry and Epidemiology “G.A. Maccacaro”, Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy