PubMed:32118389 / 891-896
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T156","span":{"begin":0,"end":5},"obj":"NNS"}],"text":"years"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok166","span":{"begin":0,"end":5},"obj":"NNS"},{"id":"lookup36","span":{"begin":0,"end":5},"obj":"date_unit"}],"text":"years"}