1. Gruppo Otologico Piacenza-Rome and University of Chieti; Italy
2. Department of Otolaryngology-Head and Neck Surgery; CHA University; Seongnam Republic of Korea
3. Department of Neuroradiology; University-Hospital of Parma; Parma Italy
4. Department of Clinical and Experimental Medicine; Otolaryngology Unit, University-Hospital of Parma; Parma Italy