PubMed:32061200 / 586-591
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T102","span":{"begin":0,"end":5},"obj":"NNS"}],"text":"years"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok111","span":{"begin":0,"end":5},"obj":"NNS"},{"id":"lookup18","span":{"begin":0,"end":5},"obj":"date_unit"}],"text":"years"}