PubMed:32224151 / 1345-1347
Annnotations
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok291","span":{"begin":0,"end":2},"obj":"CD"}],"text":"21"}
MeasurableQuantitativeAnnotation
{"project":"MeasurableQuantitativeAnnotation","denotations":[{"id":"N9","span":{"begin":0,"end":2},"obj":"num"}],"text":"21"}