PMC:7210464 / 1726-1838 JSONTXT

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    LitCovid-PD-CLO

    {"project":"LitCovid-PD-CLO","denotations":[{"id":"T9","span":{"begin":18,"end":19},"obj":"http://purl.obolibrary.org/obo/CLO_0001020"}],"text":" January 1, 2020, a massive outflow of travelers during the Chinese Spring Festival travel rush (Chunyun) in mid"}