title: Refining the concept of dysthymia.
authors.forename: M B
authors.initials: MB
authors.lastname: Keller
authors.forename: C W
authors.initials: CW
authors.lastname: Russell
mesh_terms: D002908:Chronic Disease; D003866:Depressive Disorder / Q000145:classification / Q000175:diagnosis* / Q000523:psychology; D003937:Diagnosis, Differential; D006801:Humans; D011569:Psychiatric Status Rating Scales