PubMed:32031570 / 3038-3039
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T619","span":{"begin":0,"end":1},"obj":"CD"}],"text":"4"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok730","span":{"begin":0,"end":1},"obj":"CD"}],"text":"4"}