1. Department of Radiology, Università Campus Bio-Medico di Roma, Via Alvaro Del Portillo 200, 00100 Rome, Italy
2. Department of Radiology, Università degli Studi Federico II di Napoli, Via Pansini 5, 80100 Naples, Italy
3. Department of Vascular Radiology, A.O.R.N. Antonio Cardarelli, Via A. Cardarelli 9, 80100 Naples, Italy