PubMed:32057212 / 551-553
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T87","span":{"begin":0,"end":2},"obj":"IN"}],"text":"on"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok90","span":{"begin":0,"end":2},"obj":"IN"}],"text":"on"}