PubMed:32250385 / 1669-1672
Annnotations
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok305","span":{"begin":0,"end":3},"obj":"CD"}],"text":"509"}
MeasurableQuantitativeAnnotation
{"project":"MeasurableQuantitativeAnnotation","denotations":[{"id":"N3","span":{"begin":0,"end":3},"obj":"num"}],"text":"509"}