PubMed:32217556 / 1161-1163 JSONTXT

{"project":"LitCovid-TimeML","denotations":[{"id":"tok235","span":{"begin":0,"end":2},"obj":"CD"}],"text":"31"}

{"project":"MeasurableQuantitativeAnnotation","denotations":[{"id":"N8","span":{"begin":0,"end":2},"obj":"num"}],"text":"31"}