PubMed:32154135 / 1275-1285
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T226","span":{"begin":0,"end":10},"obj":"NNS"}],"text":"singletons"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok246","span":{"begin":0,"end":10},"obj":"NNS"}],"text":"singletons"}