PubMed:32061198 / 847-853
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T144","span":{"begin":0,"end":6},"obj":"NN"}],"text":"system"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok178","span":{"begin":0,"end":6},"obj":"NN"}],"text":"system"}