PMC:7210464 / 396-522 JSONTXT

{"project":"LitCovid-PD-CLO","denotations":[{"id":"T1","span":{"begin":52,"end":64},"obj":"http://purl.obolibrary.org/obo/OBI_0000968"}],"text":". Weather characteristics 2 weeks prior are used as instrumental variables for causal inference. Stringent quarantines, city l"}

{"project":"LitCovid-sentences","denotations":[{"id":"T5","span":{"begin":2,"end":96},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":". Weather characteristics 2 weeks prior are used as instrumental variables for causal inference. Stringent quarantines, city l"}