PubMed:32061066 / 1478-1486
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T296","span":{"begin":0,"end":8},"obj":"JJ"}],"text":"negative"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok336","span":{"begin":0,"end":8},"obj":"JJ"}],"text":"negative"}