PubMed:31995857 / 1514-1522
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T277","span":{"begin":0,"end":8},"obj":"NNS"}],"text":"contacts"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok314","span":{"begin":0,"end":8},"obj":"NNS"}],"text":"contacts"}