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{"target":"http://pubannotation.org/docs/sourcedb/PMC/sourceid/7210464","sourcedb":"PMC","sourceid":"7210464","source_url":"https://www.ncbi.nlm.nih.gov/pmc/7210464","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","tracks":[{"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"}],"attributes":[{"subj":"T81","pred":"source","obj":"LitCovid-PD-CLO"},{"subj":"T82","pred":"source","obj":"LitCovid-PD-CLO"}]},{"project":"LitCovid-sentences","denotations":[{"id":"T121","span":{"begin":47,"end":136},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"attributes":[{"subj":"T121","pred":"source","obj":"LitCovid-sentences"}]}],"config":{"attribute types":[{"pred":"source","value type":"selection","values":[{"id":"LitCovid-PD-CLO","color":"#93ecb0","default":true},{"id":"LitCovid-sentences","color":"#ec9693"}]}]}}