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1 Department of Medicine, Division of Geriatric Medicine, Parkwood Hospital, St. Joseph’s Health Care London, London, Ontario, N6A 5A5, Canada 2 Gait and Brain Laboratory, Lawson Health Research Institute, the University of Western Ontario, London, Ontario, N6A 5A5, Canada 3 Centre for Functional and Metabolic Mapping, Robarts Research Institute, Department of Medical Biophysics, Schulich School of Medicine and Dentistry, the University of Western Ontario, London, Ontario, N6A 5K8, Canada 4 Department of Neuroscience, Division of Geriatric Medicine, Angers University Hospital, University Memory Clinic of Angers; UPRES EA 4638, University of Angers, UNAM, 49933, Angers, France 5 Department of Clinical Neurological Sciences, University Hospital, the University of Western Ontario, London, Ontario, N6A 5K8, Canada