1. Gardner Family Center for Parkinson's Disease and Movement Disorders, Department of Neurology; University of Cincinnati; Cincinnati Ohio USA
2. Division of Neurology, Movement disorders center, University of Toronto Canada Morton and Gloria Shulman Movement Disorders Centre and the Edmond J. Safra Program in Parkinson's Disease, Toronto Western Hospital, UHN, Division of Neurology; University of Toronto; Toronto Ontario Canada
3. Krembil Research Institute; Toronto Ontario Canada
4. Department of Neurology; Mayo Clinic; Rochester Minnesota USA
5. UCSF Movement Disorders and Neuromodulation Center, Department of Neurology; University of California San Francisco; San Francisco California USA
6. Department of Neurology; Academic Medical Center; Amsterdam The Netherlands
7. Department of Neurology; Leiden University Medical Center; Leiden The Netherlands
8. Department of Neurology; Haga Teaching Hospital; The Hague The Netherlands
9. Department of Neurosurgery; Mayo Clinic; Phoenix Arizona USA
10. Department of Neurosurgery; Medical School Hannover, MHH; Hannover Germany
11. Department of Neurology, Universitaetsmedizin Mannheim, Medical Faculty Mannheim; University of Heidelberg; Mannheim Germany
12. Functional Neurosurgery Unit; Hospital Universitario Ramón y Cajal; Madrid Spain
13. Methodist Neurological Institute; Houston Texas USA
14. Neurosurgical Department, Clinica Universidad de Navarra; Navarra Spain
15. Department of Neurology; University Hospital Würzburg; Würzburg Germany
16. Department of Neurology, Center for Movement Disorders and Neurorestoration; McKnight Brain Institute; Gainesville Florida USA
17. Department of Neurosurgery; University of Cincinnati College of Medicine. Mayfield Clinic- Neurosurgeon; Cincinnati Ohio USA
18. Department of Neurology; University Medical Center Schleswig-Holstein, Christian-Albrechts University; Kiel Germany
19. Dept. of Neurology; School of Medicine and Health Sciences - European Medical School, University Oldenburg; Oldenburg Germany
20. UCSF Department of Neurological Surgery; University of California San Francisco; San Francisco California USA