PubMed:32139397 / 51-57
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T12","span":{"begin":0,"end":6},"obj":"NN"}],"text":"period"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok14","span":{"begin":0,"end":6},"obj":"NN"}],"text":"period"}