PubMed:32243945 / 447-451
Annnotations
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok78","span":{"begin":0,"end":4},"obj":"CD"},{"id":"lookup7","span":{"begin":0,"end":4},"obj":"time"},{"id":"lookup8","span":{"begin":0,"end":4},"obj":"number"}],"text":"four"}