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.