PubMed:32220650 / 1066-1068
Annnotations
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok218","span":{"begin":0,"end":2},"obj":"CD"}],"text":"28"}
MeasurableQuantitativeAnnotation
{"project":"MeasurableQuantitativeAnnotation","denotations":[{"id":"N4","span":{"begin":0,"end":2},"obj":"num"}],"text":"28"}