[1] Morgagni Pierantoni Hosp, Dept Head Neck Surg, Otolaryngol Head Neck & Oral Surg Unit, Via Carlo Forlanini,34, I-47121 Forli, Italy
[2] Univ Sapienza, Dept Organi Senso, Viale Univ 33, I-00185 Rome, Italy
[3] Sapienza Univ, Dept Cardiovasc Resp Nephrol Anaesthesiol & Geria, Viale Univ 33, I-00185 Rome, Italy
[4] Univ Mons UMONS, Lab Anat & Cell Biol, Fac Med, Ave Champ Mars 6, B-B7000 Mons, Belgium
[5] Univ Ferrara, Dept ENT & Audiol, Via Savonarola 9, I-44121 Ferrara, Italy
[6] Univ Catania, ENT Sect, Dept Med & Surg Sci & Adv Technol GF Ingrassia, Via S Sofia,78, I-95125 Catania, Italy
[7] Osped Santa Maria Croci, Dept Head Neck Surg, Otolaryngol Head Neck & Oral Surg Unit, Viale Vincenzo Randi,5, I-48121 Ravenna, Italy
[8] Univ Milan, ENT Dept, Via Festa Perdono 7, I-20122 Milan, Italy