1. Department of Medicine, Surgery and Pharmacy, University of Medicine and Surgery, Sassari, Italy
2. Department of General and Emergency Radiology, “A. Cardarelli” Hospital, Napoli, Italy
3. Medicin Interne Service de Radiologie Diagnostique Hospital Universitaires Geneve, Suisse, USA
4. Gabriele d'Annunzio University of Chieti and Pescara, Chieti, Italy