1. Department of Neurology, University San Raffaele Roma and IRCCS San Raffaele, Rome, Italy
2. Centro per le Malattie Neurodegenerative, Dipartimento di Medicina, Università di Salerno, Baronissi, Salerno, Italy
3. Neurodegenerative Disease Center, Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy
4. Department of Human Sciences and Promotion of Quality of Life, San Raffaele University, Roma, Italy
5. San Raffaele Cassino Hospital, Cassino, Italy
6. Department of Neuroscience Rita Levi-Montalcini, University of Turin AOU Città della Salute e della Scienza, Turin, Italy
7. I.R.C.C.S. Neuromed, Pozzilli, Isernia, Italy
8. Unità di Neurologia, Dipartimento Scienze Cliniche e Sperimentali, Università degli Studi di Brescia, Brescia, Italy
9. UO Neurologia Casa di Cura Villa Margherita, Arcugnano Vicenza, Italy and Centro Parkinson e Parkinsonismi, ASST Gaetano Pini CTO, Milano, Italy
10. Department of Advanced Medical and Surgical Sciences, University of Campania "L. Vanvitelli", Naples, Italy
11. Department “G.F. Ingrassia”, University of Catania, Catania, Italy