1. Don Carlo Gnocchi Foundation; Piazzale Morandi 6 Milan Italy
2. Department of Neurosciences; Institute of Neurology, Catholic University of Sacred Heart; Rome Italy
3. Ospedale degli Infermi; Rivoli Turin Italy
4. Department of Neuroscience; University of Messina; Messina Italy
5. Institute of Clinical Neurophysiology, Division of Neurology; University Medical Centre; Ljubljana Slovenia
6. Policlinico Casilino; Rome Italy
7. Department of Neurology; Duke University Medical Center; Durham North Carolina USA
8. Department of Orthopaedic Surgery; Duke University Medical Center; Durham North Carolina USA
9. Radiology Department, DISC; Università di Genova; Genova Italy