1. Department of Clinical Neuroscience Umeå University Umeå Sweden
2. UCL Queen Square Institute of Neurology London UK
3. Department of Neurology UCLA David Geffen School of Medicine Los Angeles California USA
4. Neurosurgery Department, The Brigham and Women's Hospital Harvard Medical School Boston Massachusetts USA
5. Department of Neurology, Amsterdam University Medical Centers University of Amsterdam, Amsterdam Neuroscience Amsterdam The Netherlands
6. Department of Neurology Emory University School of Medicine Atlanta Georgia USA
7. Department of Neurosurgery Emory University School of Medicine Atlanta Georgia USA
8. Department of Neurology, Inselspital University Hospital Bern Bern Switzerland
9. Department of Neurosurgery Medical School Hannover Hannover Germany
10. The Edmond J. Safra Program in Parkinson's Disease and the Morton and Gloria Shulman Movement Disorders Clinic Toronto Western Hospital and University of Toronto Toronto Ontario Canada
11. Division of Neurosurgery, Department of Surgery University of Toronto Toronto Ontario Canada
12. HM CINAC (Centro Integral de Neurociencias Abarca Campal), Fundación Hospitales de Madrid, HM Hospitales Hospital Universitario HM Puerta del Sur Madrid Spain
13. Network Center for Biomedical Research on Neurodegenerative Diseases (CIBERNED) Instituto Carlos III Madrid Spain
14. University CEU‐San Pablo Madrid Spain
15. Department of Neurosurgery Amsterdam UMC Amsterdam The Netherlands
16. Department of Neurology University of Minnesota Minneapolis Minnesota USA