PubMed:32176808 / 358-367
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T66","span":{"begin":0,"end":9},"obj":"NN"}],"text":"variation"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok74","span":{"begin":0,"end":9},"obj":"NN"}],"text":"variation"}