title: The etiology of depression in a sample of elderly widows. A research report.
mesh_terms: D000223:Adaptation, Psychological; D000328:Adult; D000367:Age Factors; D000368:Aged; D003643:Death; D003863:Depression / Q000209:etiology*; D005260:Female; D006801:Humans; D008016:Life Change Events; D008393:Marriage; D008875:Middle Aged; D012931:Social Environment