PubMed:32156607 / 1234-1236
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T205","span":{"begin":0,"end":2},"obj":"CD"}],"text":"57"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok218","span":{"begin":0,"end":2},"obj":"CD"}],"text":"57"}