Institution: | 1. Department of Surgery, University of Verona, , Verona, Italy;2. Department of Biomedical and Neuromotorial Science, University of Bologna, , Bologna, Italy;3. Department of Oral and Maxillofacial Surgery, University of Milan, , Milan, Italy;4. Epidemiology Unit, IRCCS Fundation Ca' Granda Ospedale Maggiore Policlinico, , Milan, Italy |