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Dysthymic disorder, described by the Diagnostic and Statistical Manual of Mental Disorders--4th edition (DSM-IV) criteria as a chronically depressed mood that occurs most of the day more days than not for at least 2 years and has a lifetime prevalence rate of approximately 3.3% [Gwirtsman, 1994. Psychopharmacol. Bull. 30 (1994) 45.]. This disorder, which is… (More)