PubMed:32118389 / 1091-1093
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T198","span":{"begin":0,"end":2},"obj":"CD"}],"text":"28"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok212","span":{"begin":0,"end":2},"obj":"CD"}],"text":"28"}