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Frontotemporal dementia linked to chromosome 3 (FTD‐3) – current concepts and the detection of a previously unknown branch of the Danish FTD‐3 family

Background:  Among patients with onset of dementia below the age of 65 years, frontotemporal dementia (FTD) is the second most prevalent cause, secondary only to Alzheimer’s disease. Recent advances in understanding the heterogeneous genetic background for different clinical and neuropathological entities of FTD have involved identification of several new causative genes.