1Division of Movement Disorders, Department of Neurology, University of Louisville, Louisville, Kentucky, USA
2Movement Disorders Program, Frazier Rehab Neuroscience Institute, Louisville, Kentucky, USA
3Department of Neurological Sciences, Section of Parkinson Disease and Movement Disorders, Rush University Medical Center, Chicago, Illinois, USA
4Department of Neurology, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, North Carolina, USA
5Department of Neurology, Academic Medical Center, Amsterdam, The Netherlands
6Department of Psychology, University of Amsterdam, Amsterdam, The Netherlands
7Departments of Psychiatry and Neurology, University of Pennsylvania School of Medicine Philadelphia, Pennsylvania, USA
8Parkinson's Disease and Mental Illness Research, Education and Clinical Centers, Philadelphia Veterans Affairs Medical Center, Philadelphia, Pennsylvania, USA
9Mayo Alzheimer's Disease Research Center, Mayo Clinic, Rochester, Minnesota, USA
10Georg-August University Goettingen, Goettingen, Germany
11Paracelsus-Elena-Klinik, Kassel, Germany
12Parkinson's Disease and Movement Disorders Center, Department of Neurology, Mayo Clinic, Scottsdale, Arizona, USA
13Taub Institute on Alzheimers Disease and the Aging Brain, Department of Neurology, New York Presbyterian Hospital, Columbia University Medical Center, NY, New York, USA
14Cambridge Center for Brain Repair, Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
15Akershus University Hospital, University of Oslo, Oslo, Norway
16Karolinska Institute, Stockholm, Center for Age-Related Medicine, Stavanger University Hospital, Stockholm, Sweden
17Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas, Barcelona, Spain
18Movement Disorders Unit, Neurology Department, Sant Pau Hospital and Institute of Biomedical Research (IIB Sant Pau), Universitat Autònoma de Barcelona, Barcelona, Spain
19Department of Neurology, Hospital Donostia, Donostia, Spain
20IKERBASQUE, Basque Foundation for Science Bilbao, Bilbao, Spain
21Neuroscience Unit, BioDonostia Research Institute, San Sebatian, San Sebatian, Spain
22Institute for Aging and Health, Newcastle University, Newcastle upon Tyne, UK
23Behavioral Neurology and Movement Disorders Unit, Department of Neurology, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey