PubMed:32176772 / 886-887
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T184","span":{"begin":0,"end":1},"obj":"CD"}],"text":"4"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok208","span":{"begin":0,"end":1},"obj":"CD"}],"text":"4"}