PubMed:32125131 / 852-859
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T176","span":{"begin":0,"end":7},"obj":"NN"}],"text":"density"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok203","span":{"begin":0,"end":7},"obj":"NN"}],"text":"density"}