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Scatterplots of cortical amyloid PET load using [11C] PiB and concentrations of CSF Aβ42 (A), the Aβ42/40 ratio (B), and Aβ40 (C). Solid vertical line represents the a priori dichotomous cut-off for PiB positivity as published previously [28]. Dashed horizontal lines on panels A and B represent the best-performing cut-offs of the respective CSF biomarkers calculated in the present study.
