PubMed:32250385 / 1554-1559
Annnotations
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok276","span":{"begin":0,"end":5},"obj":"NNS"},{"id":"lookup39","span":{"begin":0,"end":5},"obj":"date_unit"}],"text":"years"}
MeasurableQuantitativeAnnotation
{"project":"MeasurableQuantitativeAnnotation","denotations":[{"id":"U1","span":{"begin":0,"end":5},"obj":"unit"}],"text":"years"}