1. Head and Neck Department ENT & Oral Surgery Unit G.B. Morgagni – L. Pierantoni Hospital of Forlì Forlì Italy
2. Otolaryngology Head and Neck Surgery University Hospital of Ferrara Ferrara Italy
3. Department of Otolaryngology and Head and Neck Surgery Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico Milan Italy
4. Department of Biomedical Surgical and Dental Sciences – University of Milan Milan Italy