1. Parkinson's Disease and Movement Disorders Center, Division of Neurology, Department of Medicine, The Ottawa Hospital Research Institute; University of Ottawa Brain and Mind Research Institute; Canada
2. Centre for Trials Research; Cardiff University; Wales UK
3. Krembil Research Institute, University Health Network and Institute of Health Policy, Management and Evaluation and Rehabilitation Institute; University of Toronto; Canada
4. Department of Biobehavioral Sciences, Teachers College; Columbia University; USA
5. Huntington's Disease Centre, Institute of Neurology; University College London, UK, Clinical Pharmacology Unit, Instituto de Medicina Molecular; Portugal
6. Swiss HD Center, Neuro Zentrum Siloah and Department of Neurology; University of Bern; Switzerland
7. Department of Physical Medicine and Rehabilitation; University of Michigan; USA
8. Department of Neurology; Wake Forest School of Medicine; USA
9. School of Psychology and Clinical Language Sciences; University of Reading; Reading UK
10. CHDI Foundation/management; USA
11. Laboratory of Clinical Pharmacology and Therapeutics, Faculty of Medicine; University of Lisbon; Portugal
12. Department of Neurological Sciences; Rush University Medical Center; Chicago USA
13. Department of Neurology; Hospital Universitário HermanosYagüe; Burgos Spain
14. National Center of Epidemiology and CIBERNED; Carlos III Institute of Health; Madrid Spain