1. Department of Radiology, Candiolo Cancer Institute, FPO-IRCCS, Strada Provinciale 142, Candiolo (TO), Piedmont, Italy
2. Department of Surgical Sciences, University of Turin, Via Verdi 8,Turin, Piedmont, Italy
3. Department of Electronics and Telecommunications, Polytechnic of Turin, Corso Duca degli Abruzzi 24, Turin, Piedmont, Italy