title: Response.
authors.forename: Rajesh
authors.initials: R
authors.lastname: Kumar
authors.forename: Ronald M
authors.initials: RM
authors.lastname: Harper
mesh_terms: D000375:Aging / Q000502:physiology*; D001931:Brain Mapping / Q000379:methods*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male