PubMed:32239591 / 766-767
Annnotations
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok140","span":{"begin":0,"end":1},"obj":"CD"}],"text":"4"}
MeasurableQuantitativeAnnotation
{"project":"MeasurableQuantitativeAnnotation","denotations":[{"id":"U2","span":{"begin":0,"end":1},"obj":"unit"}],"text":"4"}