1. Postgraduate School in Diagnostic and Interventional Radiology, University of Milan, Milan, Italy
2. Department of Radiology, IRCCS San Raffaele Hospital, Milan, Italy
3. Department of Radiology, ASST Fatebenefratelli Sacco, Milan, Italy
4. Department of ENT Surgery, ASST Fatebenefratelli Sacco, Milan, Italy