PubMed:32176772 / 895-897
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T188","span":{"begin":0,"end":2},"obj":"CD"}],"text":"18"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok212","span":{"begin":0,"end":2},"obj":"CD"}],"text":"18"}