1. Neurology Unit, Medicine Section, Faculty of Sciences and Medicine University of Fribourg Fribourg Switzerland
2. Movement Disorders Center, Department of Neurology, Inselspital Bern University Hospital, University of Bern Bern Switzerland
3. Department of Neurosurgery Inselspital University Hospital Bern Bern Switzerland
4. Neurology Unit, Department of Medicine HFR – Cantonal Hospital Fribourg Fribourg Switzerland