PubMed:32027573 / 1124-1126
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T213","span":{"begin":0,"end":2},"obj":"CD"}],"text":"51"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok237","span":{"begin":0,"end":2},"obj":"CD"}],"text":"51"}