PubMed:32171865 / 899-901
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T174","span":{"begin":0,"end":2},"obj":"CD"}],"text":"64"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok185","span":{"begin":0,"end":2},"obj":"CD"}],"text":"64"}