PubMed:32156607 / 410-419
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T73","span":{"begin":0,"end":9},"obj":"JJ"}],"text":"essential"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok77","span":{"begin":0,"end":9},"obj":"JJ"}],"text":"essential"}