1 Division of Geriatric Medicine, Department of Medicine, Parkwood Hospital, St. Joseph's Health Care London, Gait and Brain Laboratory, Lawson Health Research Institute, The University of Western Ontario, London, ON, Canada.
2 Department of Medical Biophysics, Center for Functional and Metabolic Mapping, Robarts Research Institute, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, ON, Canada.
3 Division of Geriatric Medicine, Department of Neuroscience, Angers University Hospital, Angers, France.
4 University Memory Clinic of Angers, University of Angers, Angers, France.
5 Division of Ophthalmology, Department of Neuroscience, Angers University Hospital, Angers, France.
6 Glostrup University Hospital, Copenhagen, Denmark.