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    LitCovid-PD-CLO

    {"project":"LitCovid-PD-CLO","denotations":[{"id":"T1","span":{"begin":2,"end":14},"obj":"http://purl.obolibrary.org/obo/OBI_0000968"}],"text":"s instrumental variables for causal inference. Stringent quarantines, city loc"}