1. Surgical Neurology Branch, National Institute of Neurological Disorders and StrokeNational Institutes of Health Bethesda Maryland USA
2. Division of Clinical Research, and Office of the Clinical Director, National Institute of Neurological Disorders and StrokeNational Institutes of Health Bethesda Maryland USA
3. Radiology and Imaging Sciences, Clinical CenterNational Institutes of Health Bethesda Maryland USA
4. Positron Emission Tomography Department, Clinical CenterNational Institutes of Health Bethesda Maryland USA
5. Parkinson's Disease Clinic, Office of the Clinical Director, National Institute of Neurological Disorders and StrokeNational Institutes of Health Bethesda Maryland USA
6. Clinical Trials Unit, National Institute of Neurological Disorders and StrokeNational Institutes of Health Bethesda Maryland USA
7. Department of NeurologyUniversity of California‐Irvine Irvine California USA
8. Human Motor Control Section, Medical Neurology Branch, National Institute of Neurological Disorders and StrokeNational Institutes of Health Bethesda Maryland USA
9. Department of Neurological SurgeryThe Ohio State University Wexner Medical Center Columbus Ohio USA
10. Department of Neurological SurgeryUniversity of California‐San Francisco San Francisco California USA