PubMed:32064855 / 824-832
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T160","span":{"begin":0,"end":8},"obj":"JJ"}],"text":"negative"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok166","span":{"begin":0,"end":8},"obj":"JJ"}],"text":"negative"}