```json
{
  "claims": [
    {
      "claim": "Beta-blockers may slow aortic root growth.",
      "quote": "Beta-blockers may slow aortic root growth",
      "subject": "Beta-blockers",
      "predicate": "slow",
      "object": "aortic root growth",
      "negated": false,
      "qualifier": "may",
      "subject_qualifier": null,
      "object_qualifier": null,
      "entities": ["Beta-blockers", "aortic root growth"],
      "citations": ["[3]"],
      "about": "domain",
      "basis": "secondary_source"
    }
  ]
}
```