1. Service of Otorynolaryngology, S. Giuseppe Hospital, IRCCS-Istituto Auxologico Italiano, Piancavallo, Oggebbio (VB), Italy
2. Division of Neurology and Neurorehabilitation, S. Giuseppe Hospital, IRCCS-Istituto Auxologico Italiano, Piancavallo, Oggebbio (VB), Italy
3. Department of Neuroscience, University of Turin, Italy