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The authors suggest that the common characteristics of various descriptions of major depressive illness--endogenous, endogenomorphic, psychotic, and melancholic--are an autonomous course, a need for biological treatment, and a presumed alteration in neurochemistry. The literature is reviewed to determine those symptoms which best characterize this syndrome. These symptoms may prove useful in developing valid diagnostic criteria for major depressive illness.
Nelson et al. (Thu,) studied this question.
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