{
  "resourceType": "StructureDefinition",
  "id": "ext-SmokingStatus.FrequencyQualifier",
  "url": "https://fhir.healthdata.be/StructureDefinition/ext-SmokingStatus.FrequencyQualifier",
  "name": "ExtSmokingStatusFrequencyQualifier",
  "title": "ext SmokingStatus.FrequencyQualifier",
  "status": "draft",
  "date": "2022-10-17T09:09:13.9562003+00:00",
  "publisher": "Healthdata.be (Sciensano)",
  "contact": [
    {
      "name": "Service portal – healthdata.be",
      "telecom": [
        {
          "system": "url",
          "value": "https://sciensano.service-now.com/sp",
          "use": "work"
        }
      ]
    }
  ],
  "description": "An extension to provide the frequency of smoking/tobacco use. A fitting SNOMED code does not yet exist, which complicates the usage of `Observation.component` for holding the frequency qualifier. Therefore an extension is used.",
  "copyright": "Copyright and related rights waived via CC0, https://creativecommons.org/publicdomain/zero/1.0/. This does not apply to information from third parties, for example a medical terminology system. The implementer alone is responsible for identifying and obtaining any necessary licenses or authorizations to utilize third party IP in connection with the specification or otherwise.",
  "fhirVersion": "4.0.1",
  "kind": "complex-type",
  "abstract": false,
  "context": [
    {
      "type": "element",
      "expression": "Observation"
    }
  ],
  "type": "Extension",
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Extension",
  "derivation": "constraint",
  "differential": {
    "element": [
      {
        "id": "Extension",
        "path": "Extension",
        "max": "1"
      },
      {
        "id": "Extension.url",
        "path": "Extension.url",
        "fixedUri": "https://fhir.healthdata.be/StructureDefinition/ext-SmokingStatus.FrequencyQualifier"
      },
      {
        "id": "Extension.value[x]",
        "path": "Extension.value[x]",
        "short": "Frequency",
        "definition": "The frequency of smoking or tobacco use.",
        "alias": [
          "Frequentie"
        ],
        "type": [
          {
            "code": "CodeableConcept"
          }
        ],
        "binding": {
          "strength": "extensible",
          "description": "Frequency qualifier codes",
          "valueSet": "https://fhir.healthdata.be/ValueSet/FrequencyQualifier"
        }
      }
    ]
  }
}