PubMed:32052466 / 707-713
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T112","span":{"begin":0,"end":6},"obj":"IN"}],"text":"before"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok121","span":{"begin":0,"end":6},"obj":"IN"}],"text":"before"}