Dear Mike,
A while ago I suggested to possibly go with anatomically/functionally defined ROIs for the cingulate cortex to avoid issues with voxel selection bias. While searching for some connectivity-derived labels for an analysis I've just come across a set of cingulate labels which is available at http://www.rbmars.dds.nl/CBPatlases.htm (see at the bottom of the page). Maybe this is useful for you.
Best
Helmut
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