1. Department of Radiology, Ospedale San Raffaele, Milan, Italy
2. Division of Hepatobiliary Surgery, Ospedale San Raffaele, Milan, Italy
3. Department of Radiology, Fondazione Poliambulanza Istituto Ospedaliero, Brescia, Italy
4. Faculty of Medicine, Università Vita-Salute San Raffaele, Milan, Italy