PubMed:31995857 / 1201-1207
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T212","span":{"begin":0,"end":6},"obj":"NNS"}],"text":"stages"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok235","span":{"begin":0,"end":6},"obj":"NNS"}],"text":"stages"}