BDNF	brain-derived neurotrophic factor
CRH	corticotropin-releasing hormone
DSM-5	Diagnostic and Statistical Manual for Mental Disorders-5
HAMD	Hamilton Depression Scale
HC	healthy control
HPA	hypothalamic-pituitary-adrenal
LCSPT	limbic-cortico-striatal-pallidal-thalamic
MDD	major depressive disorder
MRI	magnetic resonance imaging
PCR	polymerase chain reaction
pgACC	part of the anterior cingulate cortex
SNP	single-nucleotide polymorphism
TrkB	tyrosine kinase B receptor
3D-FSPGR	three-dimensional fast-spoiled gradient-recalled acquisition
5-HT	serotonin
5-HTT	serotonin transporter
5-HTTLPR	serotonin transporter gene polymorphism