PubMed:32159237 / 71-76
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T13","span":{"begin":0,"end":5},"obj":"NN"}],"text":"usage"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok15","span":{"begin":0,"end":5},"obj":"NN"}],"text":"usage"}