PMC:7463108 / 4714-4954 JSONTXT

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{"project":"LitCovid-sentences","denotations":[{"id":"T41","span":{"begin":101,"end":117},"obj":"Sentence"},{"id":"T42","span":{"begin":118,"end":221},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"ths that were attributable to natural and semi-synthetic opioids, such as methadone (Kolodyny et al. 2015; CDC 2017). The second phase began in 2010 in which heroin took the lead as the principal cause of overdose deaths. The most recent, t"}

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