1. Department of Neurology, University of Rome ‘Tor Vergata’ and IRCCS ‘S. Lucia’ Foundation, Rome, 00179 Italy,
2. Centre of Medical Statistics, AfaR-Fatebenefratelli Association for Research, Fatebenefratelli Hospital-Isola Tiberina, Rome, 00186 Italy and IRCCS ‘S. Giovanni di Dio’- Fatebenefratelli, Brescia, 25100 Italy
3. Second Division of Neurology, Second University of Naples, Naples, 80100 Italy
4. Department of Neurosciences, Psychiatry and Anesthesiology, University of Messina, Messina, 98100 Italy
5. Department of Neurological and Psychiatric Sciences, University of Bari, Bari, 70100 Italy
6. Neurology Unit, Department of Oncology and Neuroscience, University of Chieti ‘G. D’Annunzio’, Chieti, 66100 Italy
7. Department of Neurological Sciences, University of Catania, Catania, 95100 Italy
8. Institute of Neurology, University ‘Magna Grecia’, Catanzaro, 88100 Italy and Institute of Neurological Sciences, National Research Council, Piano di Lago Mangone, Cosenza, 87100 Italy
9. Department of Neurology, Otolaryngology, Ophthalmology and Psychiatry, University of Palermo, Palermo, 90100 Italy
10. Department of Neurology, University of Rome ‘Tor Vergata’ and IRCCS ‘S. Lucia’ Foundation, Rome, 00179 Italy