PubMed:32171865 / 66-68
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T11","span":{"begin":0,"end":2},"obj":"IN"}],"text":"on"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok13","span":{"begin":0,"end":2},"obj":"IN"}],"text":"on"}