PubMed:32077659 / 1408-1413
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T224","span":{"begin":0,"end":5},"obj":"RB"}],"text":"twice"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok238","span":{"begin":0,"end":5},"obj":"RB"}],"text":"twice"}