The division of depressive illness into depression spectrum disease and pure depressive disease.
D000342:Affective Symptoms / Q000145:classification; D000367:Age Factors; D000437:Alcoholism / Q000150:complications / Q000235:genetics; D003863:Depression / Q000145:classification* / Q000150:complications / Q000209:etiology / Q000235:genetics; D005260:Female; D006801:Humans; D008297:Male; D012737:Sex Factors