{
  "id": 21131,
  "label": "exertional headache",
  "model": {
    "label": "Mondo Disease Ontology (MONDO)",
    "source": 0
  },
  "type_id": 0,
  "reference_id": "MONDO:0023093",
  "properties": {
    "xrefs": [
      "MEDGEN:1780177",
      "UMLS:C2363911"
    ],
    "synonyms": [
      "primary Exertional headache",
      "primary headache associated with sexual activity"
    ],
    "categories": [
      {
        "ref": "MONDO:0005071",
        "name": "nervous system disorder"
      }
    ]
  },
  "isLeaf": true,
  "isRoot": false,
  "child_count": 0,
  "parents": [
    {
      "id": 20382,
      "label": "headache disorder",
      "isLeaf": false,
      "isRoot": false,
      "parents": [
        24453
      ],
      "type_id": 0,
      "properties": {
        "xrefs": [
          "EFO:0009550",
          "MEDGEN:140743",
          "MESH:D020773",
          "SCTID:230461009",
          "UMLS:C0393735"
        ],
        "synonyms": [
          "headache disorder",
          "cephalgia syndrome",
          "cephalgia syndromes",
          "chronic daily headache",
          "chronic daily headaches",
          "chronic headache",
          "chronic headaches",
          "daily headache, chronic",
          "daily headaches, chronic",
          "headache syndrome",
          "headache syndromes",
          "headache, chronic",
          "headache, chronic daily",
          "headache, intractable",
          "headaches, chronic",
          "headaches, chronic daily",
          "headaches, intractable",
          "intractable headache",
          "intractable headaches",
          "syndrome, headache"
        ],
        "categories": [
          {
            "ref": "MONDO:0005071",
            "name": "nervous system disorder"
          }
        ],
        "definition": "Various conditions with the symptom of headache. Headache disorders are classified into major groups, such as primary headache disorders (based on characteristics of their headache symptoms) and secondary headache disorders (based on their etiologies). (International Classification of Headache Disorders, 2nd ed. Cephalalgia 2004: suppl 1)"
      },
      "child_count": 4,
      "reference_id": "MONDO:0021146"
    }
  ],
  "children": [],
  "roots": [
    {
      "id": 20382,
      "label": "headache disorder"
    }
  ]
}