PubMed:31967321 / 1048-1055
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T160","span":{"begin":0,"end":7},"obj":"NN"}],"text":"surface"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok172","span":{"begin":0,"end":7},"obj":"NN"}],"text":"surface"}