1. Gardner Family Center for Parkinson's Disease and Movement Disorders, Department of Neurology; University of Cincinnati; Cincinnati OH
2. Sanatorio de la Trinidad Mitre, Departamento de Neurologia; Ciudad de Buenos Aires Argentina
3. Department of Biomedical Sciences, Paul L. Foster School of Medicine; Texas Tech University Health Sciences Center (TTUHSC); El Paso TX
4. Cognitive & Movement Disorders Clinic, Sunnybrook Health Sciences Centre; University of Toronto, and Hurvitz Brain Sciences Program, Sunnybrook Research Institute; Toronto ON Canada
5. Departments of Neurology and Radiology, Magnetic Resonance Imaging & Spectroscopy Center; University of Kentucky; Lexington KY
6. Mayfield Clinic, Department of Neurosurgery; University of Cincinnati; Cincinnati OH
7. Movement Disorders Clinic and the Edmond J. Safra Program in Parkinson's Disease; University Health Network, University of Toronto; Toronto ON Canada