PubMed:32027573 / 1013-1020
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T189","span":{"begin":0,"end":7},"obj":"NN"}],"text":"opacity"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok211","span":{"begin":0,"end":7},"obj":"NN"}],"text":"opacity"}