BDNF and depressive disorder: Secondary outcomes include major adverse cardiovascular and cerebrovascular events (MACCE), Seattle Angina Questionnaire (SAQ) score, depression and anxiety scales, the Short Form-36 (SF-36) health survey, Montreal Cognitive Assessment (MoCA) score, inflammatory cytokine levels, hypothalamic-pituitary-adrenal (HPA) axis activity, and brain-derived neurotrophic factor (BDNF) levels.