PubMed:32150618 / 1560-1571
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T234","span":{"begin":0,"end":11},"obj":"NN"}],"text":"maintenance"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok260","span":{"begin":0,"end":11},"obj":"NN"}],"text":"maintenance"}