[1] Univ Western Ontario, St Josephs Hlth Care London, Div Geriatr Med, Dept Med,Parkwood Hosp,Gait & Brain Lab,Lawson Hl, London, ON, Canada
[2] Univ Western Ontario, Dept Med Biophys, Ctr Funct & Metab Mapping, Robarts Res Inst,Schulich Sch Med & Dent, London, ON, Canada
[3] Angers Univ Hosp, Dept Neurosci, Div Geriatr Med, Angers, France
[4] Univ Angers, Univ Memory Clin Angers, Angers, France
[5] Angers Univ Hosp, Div Ophthalmol, Dept Neurosci, Angers, France
[6] Glostrup Univ Hosp, Copenhagen, Denmark