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. 2018 Jun 1;12:371. doi: 10.3389/fnins.2018.00371

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Copyright © 2018 Conejero, Navucet, Keller, Olié, Courtet and Gabelle.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Scheme of the different mechanisms that could be involved to explain the relationship between suicidal ideation, decision-making process in Alzheimer's disease (AD) based on clinical diagnosis (part left of the figure) and in AD based on biomarkers especially the amyloid load (part right of the figure). The “↑” is for an increase of the mechanism or pattern; the “↓” is for a decrease and “ = ” is related to a stability or an absence of modification of the mechanism or pattern; the “?” is for an unknown data or mechanism.