Source:http://linkedlifedata.com/resource/umls/id/C1269683
CSP: one or more periods of depression in the absence of history of manic or hypomanic episodes; chronic type lasts 2 or more years; melancholic type is more severe, has vegetative signs, and responds well to somatic therapy.,MSH: Marked depression appearing in the involution period and characterized by hallucinations, delusions, paranoia, and agitation.