PubMed:32074786 / 2958-2962
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T437","span":{"begin":0,"end":4},"obj":"MD"}],"text":"must"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok470","span":{"begin":0,"end":4},"obj":"MD"}],"text":"must"}