PubMed:32064855 / 659-661
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T127","span":{"begin":0,"end":2},"obj":"CD"}],"text":"28"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok132","span":{"begin":0,"end":2},"obj":"CD"}],"text":"28"}