PubMed:32118390 / 821-826
Annnotations
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok174","span":{"begin":0,"end":5},"obj":"NNS"},{"id":"lookup26","span":{"begin":0,"end":5},"obj":"date_unit"}],"text":"years"}
MeasurableQuantitativeAnnotation
{"project":"MeasurableQuantitativeAnnotation","denotations":[{"id":"U2","span":{"begin":0,"end":5},"obj":"unit"}],"text":"years"}