1. Unit of Neuroepidemiology, Foundation IRCCS Neurological Institute C. Besta, Milan, Italy,
2. Department of Neurology, Scientific Institute Hospital San Raffaele, Milan, Italy
3. Departments of Neurological and Psychiatric Sciences, University of Bari, Bari, Italy
4. Department of Neuroscience and Imaging, University G. D'Annunzio, Chieti, Italy
5. Department of Neurosciences, Neurology Unit, University of Parma, Parma, Italy
6. Unit of Neuroepidemiology, Foundation IRCCS Neurological Institute C. Besta, Milan, Italy
7. Department of Health Services and Research, Italian MS Society, Genoa, Italy
8. Department of Clinical Neurology, University of Bologna, Bologna, Italy
9. Neurology Department, Macerata Hospital, Macerata, Italy
10. Department of Neuromuscular Diseases, Foundation IRCCS Neurological Institute C. Besta, Milan, Italy
11. Psychology Unit, National Cancer Institute Foundation, Milan, Italy