PubMed:32164424 / 624-629
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T93","span":{"begin":0,"end":5},"obj":"NN"}],"text":"ratio"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok105","span":{"begin":0,"end":5},"obj":"NN"}],"text":"ratio"}