• Among 100 patients with chronic undifferentiated schizophrenia, parental loss before 17 years of age was significantly associated with the 39 who were treated for a depressive syndrome.
Roy A. Depression in the Course of Chronic Undifferentiated Schizophrenia. Arch Gen Psychiatry. 1981;38(3):296–297. doi:10.1001/archpsyc.1981.01780280064007
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