Figure 2.

Forest (left) and funnel (right) plots of the effect size of the differences in global gray matter volume between patients with obsessive-compulsive disorder and healthy controls (using a random-effects model). On the funnel plot, the included studies appear to be symmetrically distributed on either side of the mean effect size, suggesting no publication bias towards positive or negative studies.

Radua and Mataix-Cols Biology of Mood & Anxiety Disorders 2012 2:6   doi:10.1186/2045-5380-2-6
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