1. Movement Disorders Centre, Neurology Unit, Department of Translational Medicine University of Piemonte Orientale Novara Italy
2. Medtronic Bakken Research Center BV Maastricht The Netherlands
3. Department of Neurosurgery University Hospital “Maggiore Della Carità” Novara Italy
4. Neurology Unit, S. Andrea Hospital, Department of Translational Medicine University of Piemonte Orientale Vercelli Italy