PMC:7153689 / 442-499 JSONTXT

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    LitCovid-PD-CLO

    {"project":"LitCovid-PD-CLO","denotations":[{"id":"T4","span":{"begin":19,"end":31},"obj":"http://purl.obolibrary.org/obo/OBI_0000245"}],"text":"t the World Health Organization officially declared COVID"}