Aβ	Amyloid-beta protein
AD	Alzheimer’s disease
ALOX12	Arachidonate 12-lipoxygenase
ALOX15	Arachidonate 15-lipoxygenase
BOLD	Blood oxygenation level-dependent
CRP	C-reactive protein
DTI	Diffusion tensor imaging
FDA	Food and Drug Administration (United States)
FKBP5	FK-506 binding protein 5
GC	Vitamin D-binding protein
HPA	Hypothalamic–pituitary–adrenal axis
IL-6	Interleukin-6
miR	microRNA
MRI	Magnetic resonance imaging
NIH	National Institutes of Health (United States)
PET	Positron emission tomography
PRISMA	Preferred Reporting Items for Systematic Reviews and Meta-Analyses
PTSD	Post-Traumatic Stress Disorder
REST	RE1-silencing transcription factor gene
RSBD	Rapid Eye Movement (REM) Sleep Behavior Disorder
SEPT-4	Septin-4
SNP	Single nucleotide polymorphism
SPECT	Single photon emission computerized tomography
TBI	Traumatic brain injury
TNF-α	Tumor necrosis factor alpha
WTC	World Trade Center