PubMed:32171865 / 1199-1207
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T229","span":{"begin":0,"end":8},"obj":"NN"}],"text":"presence"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok246","span":{"begin":0,"end":8},"obj":"NN"}],"text":"presence"}