PMC:7210464 / 18623-18800 JSONTXT

{"project":"LitCovid-PD-CLO","denotations":[{"id":"T81","span":{"begin":91,"end":92},"obj":"http://purl.obolibrary.org/obo/CLO_0001020"},{"id":"T82","span":{"begin":97,"end":98},"obj":"http://purl.obolibrary.org/obo/CLO_0001021"}],"text":" cities can be absorbed by time fixed effects. As robustness checks, we re-estimate models A and B without the cities in Hubei province. In addition, since the number of clinica"}

{"project":"LitCovid-sentences","denotations":[{"id":"T121","span":{"begin":47,"end":136},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":" cities can be absorbed by time fixed effects. As robustness checks, we re-estimate models A and B without the cities in Hubei province. In addition, since the number of clinica"}