PubMed:32220650 / 1412-1414 JSONTXT

{"project":"LitCovid-TimeML","denotations":[{"id":"tok316","span":{"begin":0,"end":2},"obj":"CD"}],"text":"31"}

{"project":"MeasurableQuantitativeAnnotation","denotations":[{"id":"N2","span":{"begin":0,"end":2},"obj":"num"}],"text":"31"}