Prevalence of depression in the aged: formal calculations versus clinical facts.
Slater
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SL
Katz
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D000368:Aged; D002391:Catchment Area, Health; D003863:Depression / Q000453:epidemiology*; D004812:Epidemiologic Methods; D006801:Humans; D015995:Prevalence; D014481:United States / Q000453:epidemiology