[1] Univ Palermo, Dept Biomed Nurosci & Adv Diagnost Bi N D, I-90127 Palermo, Italy
[2] ARNAS Civ Cristina & Benfratelli Hosp, Neurol Unit, I-90127 Palermo, Italy
[3] Univ Cambridge, Dept Comp Sci & Technol, Cambridge CB2 1TN, England
[4] PO S Antonio Abate, Neurol & Stroke Unit, I-91016 Trapani, Italy