PubMed:32031570 / 2670-2675
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T519","span":{"begin":0,"end":5},"obj":"NNS"}],"text":"years"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok611","span":{"begin":0,"end":5},"obj":"NNS"},{"id":"lookup71","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"}