C9orf72 and frontotemporal dementia: “frontotemporal dementia - current diagnostic criteria for bvFTD were included in the study, of whom 10 were genetically confirmed (carrying mutations in chromosome 9 open reading frame 72 [C9orf72] = 5, progranulin [GRN] = 3 and microtubule associated protein tau [MAPT] = 2)”