PubMed:32240670 / 680-682 JSONTXT

{"project":"LitCovid-TimeML","denotations":[{"id":"tok121","span":{"begin":0,"end":2},"obj":"CD"}],"text":"51"}

{"project":"MeasurableQuantitativeAnnotation","denotations":[{"id":"N1","span":{"begin":0,"end":2},"obj":"num"}],"text":"51"}