1. Department of Neurologythe Royal Melbourne Hospital Parkville Australia
2. Kings College London, Institute of PsychiatrySection of Cognitive Neuropsychiatry London UK
3. Department of PsychiatryUniversity of Pennsylvania Philadelphia Pennsylvania USA
4. Parkinson's Disease and Mental Illness Research, Education and Clinical Centers (Philadelphia Parkinson's Disease Research, Education and Clinical Center (PADRECC) and Mental Illness Research Education Clinical, Centers of Excellence (MIRECC))Philadelphia Veterans Affairs Medical Center Philadelphia Pennsylvania USA
5. Division of Neurology, Department of MedicineUniversity of Malaya Kuala Lumpur Malaysia
6. Department of NeurologyBon Secours Hospital Cork Ireland
7. Department of PsychiatryUniversity of Cambridge Cambridge UK
8. Movement Disorders Center, Department of NeurologyUniversity Hospital (Inselspital) and University of Bern Bern Switzerland
9. Cure Huntington's Disease InitiativeEl (CHDI) Management/CHDI Foundation Princeton New Jersey USA
10. Department of NeurologyRadboud University Nijmegen Medical Center Nijmegen The Netherlands
11. Department of PsychiatryMaastricht University Medical Center Maastricht The Netherlands
12. National Center of Epidemiology and Centro de Investigacion Biomedica en Red sobre Enfermedades Neurodegenerativas (CIBERNED)Carlos III Institute of Health Madrid Spain
13. Department of Neurological SciencesRush University Medical Center Chicago Illinois USA
14. Department of Clinical NeurosciencesInstitute of Neurology, University College London London UK