PubMed:32062875 / 562-569
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T79","span":{"begin":0,"end":7},"obj":"NN"}],"text":"history"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok87","span":{"begin":0,"end":7},"obj":"NN"}],"text":"history"}