Grey matter volume analysis
MRI data were processed following our prior work [20], using the
automated cortical and subcortical extraction pipeline within Brainsuite
software (v.18a) [21]. Following visual inspection, total volume
(gray matter (GM) and white matter (WM)) of the left and right
hippocampus (mm3) were estimated. Total intracranial
volume (GM, WM, and cerebrospinal fluid) was estimated for use as a
covariate.