1. Department of Otorhinolaryngology–Head and Neck Surgery, University Hospital of Modena, Modena, Italy2Department of Otorhinolaryngology–Head and Neck Surgery, Inselspital, University Hospital and University of Bern, Bern, Switzerland
2. Department of Otorhinolaryngology–Head and Neck Surgery, University Hospital of Modena, Modena, Italy
3. Department of Otorhinolaryngology–Head and Neck Surgery, Inselspital, University Hospital and University of Bern, Bern, Switzerland