1. Department of Experimental, Diagnostic and Specialty Medicine; University of Bologna; Bologna Italy
2. Epidemiology and Biostatistics Service; IRCCS; Institute of Neurological Sciences of Bologna; Bellaria Hospital; Bologna Italy
3. Neuroepidemiology Unit; Foundation IRCCS Neurological Institute C. Besta; Milan Italy
4. Department of Neurofarba; Section of Neurosciences; University of Florence; Florence Italy
5. SC Neurologia; Department of Medical Sciences; IRCCS ‘Casa Sollievo della Sofferenza’; San Giovanni Rotondo Italy
6. Department of Neurological Sciences and Vision; University of Genoa; Genoa Italy
7. Department of Neurology; MS Centre; San Raffaele Scientific Institute; Vit-Salute San Raffaele University; Milan Italy
8. Experimental Biomedicine and Clinical Neurosciences; University of Palermo; Palermo Italy
9. Neurology Unit; ASL 3 Genovese; Genoa Italy
10. Neurology Unit; University of Ferrara; Ferrara Italy