Hippocampal segmentation
Automatic hippocampal (subfield) segmentations were performed using FreeSurfer image analysis (version 7.1.1; Boston, MA, USA; Total hippocampal volume, our primary outcome measure, was calculated by the hippocampal subfield segmentation module. Additionally, this module calculated 12 hippocampal subfields of which 6 subfields were pre-selected for analyses to reduce false positive findings, based on relevance and accuracy (