PubMed:32172226 / 1235-1243
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T197","span":{"begin":0,"end":8},"obj":"NNS"}],"text":"controls"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok222","span":{"begin":0,"end":8},"obj":"NNS"}],"text":"controls"}