Otolaryngology Department, University of Catania, Catania, Italy. Otolaryngology Department, AORMN, Fano- Pesaro, Italy. Department of Medical, Surgical and Experimental Sciences, Maxillofacial Surgery Operative Unit, University of Sassari, Sassari, Italy. Department of Biomedical Sciences, PhD School of Biomedical Sciences, University of Sassari, Sassari, Italy. Department of Neuroscience, Reproductive and Odontostomatological Sciences, Ear, Nose and Throat Section, Federico II University, Naples Italy. Otolaryngology Department, University of Salerno, Salerno, Italy. Department of Biomedical Sciences, Humanitas University, Via Rita Levi Montalcini, 4, 20090 Pieve Emanuele (MI), Italy. Department of Otorhinolaryngology Head and Neck Surgery, Humanitas Clinical and Research Center -IRCCS-, Via Alessandro Manzoni, 56, 20089 Rozzano (MI), Italy. Otolaryngology Department, University La Sapienza, Rome, Italy. Otolaryngology Department, San-Giovanni Hospital, Rome, Italy. Department of Otolaryngology, University of Michigan Medical School, - Head and Neck Surgery, Ann Arbor (MI), USA.