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Relationship between (a) mini mental state examination (MMSE) score and the urge-to-cough (UTC) log–log scale slope of log Cu (where Cu=concentration of citric acid at a threshold of UTC), which illustrates significant differences; (b) comparison of the UTC log–log scale slope of log Cu among the control group, the Alzheimer's disease (AD) group and the dementia with Lewy bodies (DLB) group. There was no significant difference amongst the three groups (p=0.111).
