PubMed:32150360 / 3469-3471
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T593","span":{"begin":0,"end":2},"obj":"CD"}],"text":"28"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok652","span":{"begin":0,"end":2},"obj":"CD"}],"text":"28"}