PMC:7210464 / 413-465 JSONTXT

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    LitCovid-PD-CLO

    {"project":"LitCovid-PD-CLO","denotations":[{"id":"T1","span":{"begin":35,"end":47},"obj":"http://purl.obolibrary.org/obo/OBI_0000968"}],"text":"eristics 2 weeks prior are used as instrumental vari"}