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Semantic dementia, progressive non-fluent aphasia and their association with amyotrophic lateral sclerosisSaxon, Jennifer A; Harris, Jennifer M; Thompson, Jennifer C; Jones, Matthew; Richardson, Anna M T; Langheinrich, Tobias; Neary, David; Mann, David M A; Snowden, Julie S · Journal of Neurology, Neurosurgery & Psychiatry · 2017