 No diagnostic category was allocated a depressive episode of shorter duration.Thus, intermittent depressive disorder, included in the Research Diagnostic Criteria (1975) was considered to identify minor versions of major depression ("minor depression") and not included in the DSM-III.However, based on data from epidemiological studies, the Swiss psychiatrist and researcher, Jules Angst, coined the concept "recurrent brief depression" (RBD) and provided diagnostic criteria for this type of mood disorder in 1985.