PubMed:32134681 / 1980-1989
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T369","span":{"begin":0,"end":9},"obj":"NNS"}],"text":"opacities"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok441","span":{"begin":0,"end":9},"obj":"NNS"}],"text":"opacities"}