Definite Behavioral Variant of Frontotemporal Dementia with C9ORF72 Expansions Despite Positive Alzheimer's Disease Cerebrospinal Fluid Biomarkers. - Wallon, David; Rovelet-Lecrux, Anne; Deramecourt, Vincent; Pariente, Jeremie; Auriacombe, Sophie; Le Ber, Isabelle; Schraen, Suzanna; Pasquier, Florence; Campion, Dominique; Hannequin, Didier (Journal of Alzheimer's Disease, 2012)