PubMed:32113196 / 1087-1093
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T177","span":{"begin":0,"end":6},"obj":"NN"}],"text":"period"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok188","span":{"begin":0,"end":6},"obj":"NN"}],"text":"period"}