Olivier Beauchet1,2,3, Elise J Levinoff1, Gilles Allali4. 1. Department of Medicine, Division of Geriatric Medicine, Sir Mortimer B. Davis-Jewish General Hospital, Lady Davis Institute for Medical Research, McGill University, Montreal, Quebec, Canada. 2. Dr. Joseph Kaufmann Chair in Geriatric Medicine, Faculty of Medicine, McGill University, Montreal, Quebec, Canada. 3. Centre of Excellence on Aging and Chronic Diseases, McGill Integrated University Health Network, Montreal, Quebec, Canada. 4. Department of Neurology, Geneva University Hospital and University of Geneva, Geneva, Switzerland.