PMC:7210464 / 398-492 JSONTXT

{"project":"LitCovid-PD-CLO","denotations":[{"id":"T1","span":{"begin":50,"end":62},"obj":"http://purl.obolibrary.org/obo/OBI_0000968"}],"text":"Weather characteristics 2 weeks prior are used as instrumental variables for causal inference."}

{"project":"LitCovid-sentences","denotations":[{"id":"T5","span":{"begin":0,"end":94},"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."}