1. Morton and Gloria Shulman Movement Disorders Centre and the Edmond J. Safra Program in Parkinson’s Disease Research, Toronto Western Hospital and University of Toronto, Toronto, ON, Canada
2. London Health Sciences Centre, London, ON, Canada
3. Departments of Neurology and Biostatistics, Epidemiology and Informatics, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
4. Krembil Research Institute, University Health Network, Toronto, ON, Canada
5. Department of Speech Language Pathology, University of Toronto, Toronto, ON, Canada
6. Rehabilitation Science Institute, University of Toronto, Toronto, ON, Canada
7. Department of Otolaryngology- Head and Neck Surgery, University of Toronto, Toronto, ON, Canada