PMC:7371427 / 67657-67695 JSONTXT

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    LitCovid-sentences

    {"project":"LitCovid-sentences","denotations":[{"id":"T406","span":{"begin":0,"end":38},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"control for differences across queries"}