Depression is a serious and debilitating mental health disorder, affecting up to 7% of the adult population at any given time, according to the World Health Organization. A single episode of major depressive disorder, according to the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5), is characterized by five or more symptoms (including a pervasively depressed mood and/or lack of interest or pleasure) across 2 weeks, with a change of prior function and daily symptoms that generate distress or impairment. Symptoms include changes in sleep patterns, appetite, physical movement, energy level, self-worth, decision making, and concentration, as well as suicidal ideation or attempts. However, depression is a complex phenotype, with various specifiers (peripartum onset, mixed features) as well as other types of depressive ...