PubMed:31991628 / 584-593
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T107","span":{"begin":0,"end":9},"obj":"NNS"}],"text":"exposures"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok114","span":{"begin":0,"end":9},"obj":"NNS"}],"text":"exposures"}