PubMed:32133830 / 1397-1404
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T257","span":{"begin":0,"end":7},"obj":"NN"}],"text":"history"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok291","span":{"begin":0,"end":7},"obj":"NN"}],"text":"history"}