1. Department of Neurology The Ohio State University Wexner Medical Center Columbus Ohio USA
2. Department of Neurological Sciences University of Nebraska Medical Center Omaha Nebraska USA
3. Department of Neurological Sciences Rush University Medical Center Chicago Illinois USA
4. Department of Neurology Emory University Atlanta Georgia USA
5. Gardner Family Center for Parkinson's Disease and Movement Disorders, Department of Neurology University of Cincinnati Cincinnati Ohio USA
6. Department of Neurology University of Florida College of Medicine Gainesville Florida USA
7. Department of Neurology Mayo Clinic Rochester Minnesota USA
8. Department of Neurosurgery Hannover Medical School, MHH Hannover Germany
9. Department of Neurology Southern Illinois University School of Medicine Springfield Illinois USA
10. Department of Neurology Universitätsklinikum Schleswig‐Holstein, Christian‐Albrechts University Kiel Germany