PubMed:32176808 / 973-982
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T161","span":{"begin":0,"end":9},"obj":"NN"}],"text":"variation"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok181","span":{"begin":0,"end":9},"obj":"NN"}],"text":"variation"}