PubMed:32133152 / 273-279
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T45","span":{"begin":0,"end":6},"obj":"NNS"}],"text":"groups"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok53","span":{"begin":0,"end":6},"obj":"NNS"}],"text":"groups"}