PubMed:32061200 / 1097-1105
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T191","span":{"begin":0,"end":8},"obj":"JJ"}],"text":"negative"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok209","span":{"begin":0,"end":8},"obj":"JJ"}],"text":"negative"}