1. Department of Neurosurgery, Inselspital; Bern University Hospital and University of Bern; Bern Switzerland
2. Department of Neurology, Inselspital; Bern University Hospital and University of Bern; Bern Switzerland
3. Neuroscience Technologies; Barcelona Spain
4. Sobell Department of Motor Neuroscience and Movement Disorders, Institute of Neurology; University College London; London UK