Vincent Huin1,2, Mathieu Barbier1, Alexandra Durr1, Isabelle Le Ber1,3. 1. Sorbonne Université, Paris Brain Institute, APHP, INSERM, CNRS, Paris, France. 2. Univ. Lille, Inserm, CHU Lille, U1172-LilNCog (JPARC)-Lille Neuroscience and Cognition, F-59000 Lille, France. 3. AP-HP, National Reference center "rare and young dementias", IM2A, Pitié-Salpêtrière University Hospital, Paris, France.