PubMed:31995857 / 1610-1618
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T291","span":{"begin":0,"end":8},"obj":"VBN"}],"text":"required"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok329","span":{"begin":0,"end":8},"obj":"VBN"},{"id":"event1","span":{"begin":0,"end":8},"obj":"I_STATE"}],"text":"required"}