1. University of Cincinnati Gardner Neuroscience Institute, Gardner Family Center for Parkinson’s Disease and Movement Disorders, Department of Neurology, University of Cincinnati, Cincinnati, Ohio.
2. Department of Neurology, University Hospital Inselspital, Bern, Switzerland
3. Neuropsychiatry, Centre for Clinical Brain Studies, University of Edinburgh, Edinburgh, United Kingdom
4. Motor Control and Movement Disorders Group, Institute of Molecular and Clinical Sciences, St George's University of London, London, United Kingdom
5. Department of Psychology, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, United Kingdom
6. Human Motor Control Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland
7. Department of Neurology, University of Louisville, Louisville, Kentucky
8. Department of Psychiatry, Alpert Medical School of Brown University, Providence, Rhode Island
9. Department of Neurology, Alpert Medical School of Brown University, Providence, Rhode Island
10. Morton and Gloria Shulman Movement Disorders Centre, Toronto Western Hospital and Edmond J. Safra Program in Parkinson Disease, University of Toronto, Toronto, Ontario, Canada
11. Section of Cognitive Neuropsychiatry, Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, United Kingdom
12. Academic Neurology Unit, University of Sheffield, Royal Hallamshire Hospital, Sheffield, United Kingdom
13. Department of Psychiatry, University of Cambridge, Cambridge, United Kingdom
14. Centre for Clinical Brain Sciences, University of Edinburgh, Western General Hospital, Edinburgh, United Kingdom.
15. Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy