PubMed:32035431 / 220-222
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T38","span":{"begin":0,"end":2},"obj":"CD"}],"text":"20"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok44","span":{"begin":0,"end":2},"obj":"CD"}],"text":"20"}