1. Magnetic Resonance Center (CERM), University of Florence, Via L. Sacconi 6, 50019 Sesto Fiorentino, Italy
2. Department of Experimental Medicine, University of Perugia, Piazzale Gambuli 1, 06132 Perugia, Italy
3. Department of Chemistry “Ugo Schiff”, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
4. Clinica Neurologica, Università degli Studi di Perugia, Piazzale Gambuli 1, 06132 Perugia, Italy