1. Department of Radiology, University Hospital of Cagliari, 09042 Monserrato, Italy
2. Stroke Monitoring and Diagnostic Division, AtheroPoint™, Roseville, CA 95661, USA
3. IRCCS SYNLAB SDN S.p.A., 80143 Naples, Italy
4. Department of Radiology, University Hospital of Sassari, 07100 Sassari, Italy