PubMed:32134681 / 2093-2095
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T403","span":{"begin":0,"end":2},"obj":"CD"}],"text":"28"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok481","span":{"begin":0,"end":2},"obj":"CD"}],"text":"28"}