PubMed:32049687 / 880-887
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T153","span":{"begin":0,"end":7},"obj":"NNS"}],"text":"workers"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok172","span":{"begin":0,"end":7},"obj":"NNS"}],"text":"workers"}