[1] Sondrio Hosp, Otorhinolaryngol Unit, ASST Valtellina & Alto Lario, I-23100 Sondrio, Italy
[2] FPO IRCCS, Candiolo Canc Inst, Otorhinolaryngol Head & Neck Surg, I-10060 Turin, Italy
[3] IRCCS San Raffaele Sci Inst, Div Head & Neck Dept, Otorhinolaryngol Unit, I-20132 Milan, Italy
[4] Univ Vita Salute San Raffaele, Sch Med, I-20132 Milan, Italy