1. Maxillofacial Surgery Operative UnitUniversity Hospital of Sassari Sassari Italy
2. King's College London UK
3. Maxillofacial Surgery UnitUniversity Hospital of Naples “Federico II” Naples Italy
4. Maxillofacial Surgery Operative Unit; Bellaria and Maggiore Hospital, AUSL Bologna Italy
5. Otolaryngology Operative UnitUniversity Hospital of Sassari Sassari Italy
6. Maxillofacial Surgery Department, San Paolo Hospital, ASST Santi Paolo e CarloUniversity of Milan Milan Italy
7. Otolaryngology Operative Unit, San Paolo Hospital, ASST Santi Paolo e Carlo, Department of Health SciencesUniversity of Milan Milan Italy
8. Department of Medical, Surgical and Experimental SciencesUniversity of Sassari Sassari Italy
9. Infectious Diseases Operative UnitUniversity Hospital of Sassari Sassari Italy
10. Respiratory Diseases Operative UnitUniversity Hospital of Sassari Sassari Italy
11. Respiratory Diseases Operative Unit, Department of Medicine, Surgery and Dentistry, “Scuola Medica Salernitana”University of Salerno Baronissi Salerno Italy
12. Surveillance and Prevention DepartmentUniversity Hospital of Sassari Sassari Italy
13. Otolaryngology Operative Unit, Department of Medicine, Surgery and Dentistry, “Scuola Medica Salernitana”University of Salerno Baronissi Salerno Italy
14. University of Turin Turin Italy