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article_snippet.sent: As part of the new study, doctors used data from the Baltimore Epidemiologic Catchment Area (ECA) Study Wave 1, which began in 1981, up to Wave 4, which ended in 2005.
article_snippet.sent: Source: NHS Choices .
article_snippet.sent: NHS Choices then assessed whether the people in Source: NHS Choices met the criteria for a mental disorder, as laid out in the latest edition of the Diagnostic and Statistical Manual of Mental Disorders, the U.S. bible for psychiatric conditions.