PubMed:32027573 / 1691-1693
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T338","span":{"begin":0,"end":2},"obj":"CD"}],"text":"50"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok367","span":{"begin":0,"end":2},"obj":"CD"}],"text":"50"}