1 Division of Neurosurgery, Department of Medical and Surgical Specialties, Radiological Sciences, and Public Health, Spedali Civili of Brescia, University of Brescia, Brescia, Italy.
2 SURGEM, Surgical Research and Training Center, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy.
3 Università Cattolica del Sacro Cuore, Rome, Italy.
4 Otorhinolaryngology and Head-Neck Surgery Unit, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy.