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BDNF plasma concentrations in all subjects subdivided into those with normal cognition (MMSE ≥ 25), those with mild dementia (21 ≤ MMSE ≤ 24), those with moderate dementia (10 ≤ MMSE ≤ 20) and those with severe dementia (MMSE ≤ 9). BDNF, brain-derived neurotrophic factor; and MMSE, Mini-Mental State Examination. * p ≤ 0.050 vs. MMSE ≥ 25.
