PubMed:32074786 / 2659-2663
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T397","span":{"begin":0,"end":4},"obj":"MD"}],"text":"must"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok427","span":{"begin":0,"end":4},"obj":"MD"}],"text":"must"}