PubMed:32074786 / 2011-2022
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T302","span":{"begin":0,"end":11},"obj":"NN"}],"text":"obstruction"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok327","span":{"begin":0,"end":11},"obj":"NN"}],"text":"obstruction"}