PMC:7210464 / 456-627 JSONTXT

{"project":"LitCovid-PD-CLO","denotations":[{"id":"T2","span":{"begin":161,"end":166},"obj":"http://purl.obolibrary.org/obo/NCBITaxon_10239"}],"text":"ntal variables for causal inference. Stringent quarantines, city lockdowns, and local public health measures imposed in late January significantly decreased the virus tran"}