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Frequency of FTD among patients with C9ORF72 hexanucleotide repeat expansion according to the presence of a family history for ALS, FTD, or both (p = 0.008)
Abbreviations: ALS = amyotrophic lateral sclerosis; fALS = familial ALS; FTD = frontotemporal dementia; sALS = sporadic ALS.
