PubMed:32171865 / 793-795
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T135","span":{"begin":0,"end":2},"obj":"CD"}],"text":"50"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok146","span":{"begin":0,"end":2},"obj":"CD"}],"text":"50"}