PubMed:32064853 / 568-574
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T97","span":{"begin":0,"end":6},"obj":"NNS"}],"text":"ratios"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok104","span":{"begin":0,"end":6},"obj":"NNS"}],"text":"ratios"}