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. 2018 May 14;9:702. doi: 10.3389/fpsyg.2018.00702

FIGURE 1.

FIGURE 1

Annual publications show an exponential increase for both topics, biomarkers for mental disorders (blue line) and fMRI research on Major Depressive Disorder (red line). This documents a strongly increasing scientific interest and relevance of the topic of this article. Source: Topic searches on the ISI Web of Science (www.webofknowledge.com) using biomarker AND “mental disorder” and “major depressive disorder” AND fMRI, respectively.