1. Department of Neuroscience; Division of Geriatric Medicine; Angers University Hospital, University Memory Clinic of Angers, UPRES EA 4638; University of Angers; UNAM; Angers France
2. Department of Medicine; Division of Geriatric Medicine; Parkwood Hospital; St. Joseph's Health Care London; Gait and Brain Lab; Lawson Health Research Institute; University of Western Ontario; London Ontario Canada
3. Center for Functional and Metabolic Mapping; Robarts Research Institute; Department of Medical Biophysics; Schulich School of Medicine and Dentistry; University of Western Ontario; London Ontario Canada
4. Department of Clinical Neurological Sciences; University Hospital; University of Western Ontario; London Ontario Canada
5. Department of Neurology; Boston University School of Medicine; National Heart; Lung, and Blood Institute; Framingham MA USA