PubMed:31995857 / 86-96
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T12","span":{"begin":0,"end":10},"obj":"NN"}],"text":"BACKGROUND"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok15","span":{"begin":0,"end":10},"obj":"NNP"}],"text":"BACKGROUND"}