PubMed:32125131 / 193-195
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T32","span":{"begin":0,"end":2},"obj":"CD"}],"text":"20"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok37","span":{"begin":0,"end":2},"obj":"CD"}],"text":"20"}