1. Centre for Molecular Medicine and Therapeutics, and Centre for Huntington's Disease at UBC Hospital, Department of Medical Genetics and Division of Neurology, Department of Medicine, University of British Columbia and BC Children's Hospital, Vancouver, Canada.
2. Huntington's Disease Centre, Department of Neurodegenerative Disease, and UK Dementia Research Institute at UCL, UCL Queen Square Institute of Neurology, University College London, London, UK.