PubMed:32160942 / 521-530
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T86","span":{"begin":0,"end":9},"obj":"JJ"}],"text":"essential"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok92","span":{"begin":0,"end":9},"obj":"JJ"}],"text":"essential"}