1. Department of Experimental, Diagnostic and Specialty Medicine (DIMES), Division of Radiology, S.Orsola-Malpighi Hospital, Bologna, Italy
2. Department of Radiology, Santa Maria della Scaletta Hospital, Imola, Bologna, Italy
3. Department of Radiology, Cardiothoracic section, Policlinico Sant Orsola-Malpighi, Bologna, Italy