1. Maxillofacial Surgery Operative UnitUniversity Hospital of Sassari Sassari Italy
2. Department of Medical, Surgical and Experimental SciencesUniversity of Sassari Sassari Italy
3. Respiratory Diseases Operative UnitUniversity Hospital of Sassari Sassari Italy
4. Infectious Diseases Operative UnitUniversity Hospital of Sassari Sassari Italy
5. Maxillofacial Surgery Operative UnitBellaria and Maggiore Hospital Bologna Italy
6. Department of Surveillance and PreventionUniversity Hospital of Sassari Sassari Italy
7. Otolaryngology Operative UnitUniversity Hospital of Sassari Sassari Italy
8. Maxillofacial Surgery UnitUniversity Hospital of Naples “Federico II” Naples Italy