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We examined data from a community-based study of persons who inject drugs (n\u2009=\u2009483) in California and a general population survey from the National Survey on Drug Use and Health (n\u2009=\u20091264) and found that individuals born after 1980 were more likely than were individuals born before 1980 to initiate opioids through nonmedical use of prescription opioids than heroin. <\/jats:p>","DOI":"10.2105\/ajph.2015.302972","type":"journal-article","created":{"date-parts":[[2015,12,21]],"date-time":"2015-12-21T21:40:58Z","timestamp":1450734058000},"page":"298-300","source":"Crossref","is-referenced-by-count":26,"title":["Initiation of Heroin and Prescription Opioid Pain Relievers by Birth Cohort"],"prefix":"10.2105","volume":"106","author":[{"given":"Scott P.","family":"Novak","sequence":"first","affiliation":[{"name":"Scott P. Novak is with RTI International, Research Triangle Park, NC. 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