1 Department of Otolaryngology Head and Neck Surgery, S. Orsola-Malpighi University Hospital, Via Massarenti 9, 40138 Bologna, Italy. Electronic address: ottavio.piccin2@unibo.it.
2 Department of Otolaryngology Head and Neck Surgery, S. Orsola-Malpighi University Hospital, Via Massarenti 9, 40138 Bologna, Italy.