Chunk #6 — METHODS — Brain imaging phenotypes
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We used UKB data on left and right hippocampal volumes generated through subcortical volumetric sub‐segmentation using FreeSurfer (N = 41,238). Specifically, we were interested in examining the combined total hippocampal volume obtained by summing the left and right measures (Data‐field IDs: 26641 and 26663, respectively).