PubMed:32023682 / 1238-1250
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T202","span":{"begin":0,"end":12},"obj":"NN"}],"text":"surveillance"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok215","span":{"begin":0,"end":12},"obj":"NN"}],"text":"surveillance"}