1 Université de Paris, Inserm U1153, Epidemiology of Ageing and Neurodegenerative Diseases, Paris 75010, France; Cognitive Neurology Center, Lariboisiere - Fernand Widal Hospital, AP-HP, Université de Paris, Paris, France. Electronic address: julien.dumurgier@aphp.fr.
2 Université de Paris, Inserm U1153, Epidemiology of Ageing and Neurodegenerative Diseases, Paris 75010, France; Department of Epidemiology and Public Health, University College London, London, UK.