PubMed:32074786 / 1532-1538
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T234","span":{"begin":0,"end":6},"obj":"NNS"}],"text":"stages"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok250","span":{"begin":0,"end":6},"obj":"NNS"}],"text":"stages"}