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Source1

{
  "resourceType": "StructureDefinition",
  "id": "nfdi4health-ex-mds-study-target-followup-duration",
  "url": "https://www.nfdi4health.de/fhir/metadataschema/StructureDefinition/nfdi4health-ex-mds-study-target-followup-duration",
  "version": "0.9",
  "name": "NFDI4Health_EX_MDS_Study_Target_Followup_Duration",
  "title": "NFDI4Health EX MDS Study Target Followup Duration",
  "status": "draft",
  "publisher": "NFDI4Health",
  "contact": [
    {
      "telecom": [
        {
          "system": "url",
          "value": "https://www.nfdi4health.de"
        }
      ]
    }
  ],
  "description": "Extension informing about the target follow-up duration of a study.",
  "fhirVersion": "4.0.1",
  "mapping": [
    {
      "identity": "rim",
      "uri": "http://hl7.org/v3",
      "name": "RIM Mapping"
    },
    {
      "identity": "NFDI4Health",
      "name": "NFDI4Health to FHIR Mapping"
    }
  ],
  "kind": "complex-type",
  "abstract": false,
  "context": [
    {
      "type": "element",
      "expression": "ResearchStudy"
    }
  ],
  "type": "Extension",
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Extension",
  "derivation": "constraint",
  "differential": {
    "element": [
      {
        "id": "Extension",
        "path": "Extension",
        "short": "Target follow-up duration",
        "definition": "If applicable, anticipated time period over which each participant would be followed.",
        "max": "1",
        "mapping": [
          {
            "identity": "NFDI4Health",
            "map": "Design.nonInterventional.targetFollowUpDuration"
          }
        ]
      },
      {
        "id": "Extension.extension",
        "path": "Extension.extension",
        "min": 1
      },
      {
        "id": "Extension.extension:number",
        "path": "Extension.extension",
        "sliceName": "number",
        "min": 1,
        "max": "1"
      },
      {
        "id": "Extension.extension:number.extension",
        "path": "Extension.extension.extension",
        "max": "0"
      },
      {
        "id": "Extension.extension:number.url",
        "path": "Extension.extension.url",
        "fixedUri": "number"
      },
      {
        "id": "Extension.extension:number.value[x]",
        "path": "Extension.extension.value[x]",
        "min": 1,
        "type": [
          {
            "code": "Quantity"
          }
        ]
      },
      {
        "id": "Extension.extension:number.value[x].value",
        "path": "Extension.extension.value[x].value",
        "short": "Target follow-up duration",
        "definition": "Numerical value of the target follow-up duration.",
        "min": 1,
        "mapping": [
          {
            "identity": "NFDI4Health",
            "map": "Design.nonInterventional.targetFollowUpDuration.number"
          }
        ]
      },
      {
        "id": "Extension.extension:number.value[x].system",
        "path": "Extension.extension.value[x].system",
        "min": 1
      },
      {
        "id": "Extension.extension:number.value[x].code",
        "path": "Extension.extension.value[x].code",
        "short": "Unit of time",
        "definition": "Unit of measurement used to describe the follow-up duration.",
        "min": 1,
        "binding": {
          "strength": "required",
          "valueSet": "https://www.nfdi4health.de/fhir/metadataschema/ValueSet/nfdi4health-vs-mds-time-units-ucum"
        },
        "mapping": [
          {
            "identity": "NFDI4Health",
            "map": "Design.nonInterventional.targetFollowUpDuration.timeUnit"
          }
        ]
      },
      {
        "id": "Extension.extension:frequency",
        "path": "Extension.extension",
        "sliceName": "frequency",
        "min": 0,
        "max": "1"
      },
      {
        "id": "Extension.extension:frequency.extension",
        "path": "Extension.extension.extension",
        "max": "0"
      },
      {
        "id": "Extension.extension:frequency.url",
        "path": "Extension.extension.url",
        "fixedUri": "frequency"
      },
      {
        "id": "Extension.extension:frequency.value[x]",
        "path": "Extension.extension.value[x]",
        "short": "Number of follow-ups conducted",
        "definition": "The number of follow-ups conducted within the specified duration.",
        "min": 1,
        "type": [
          {
            "code": "integer"
          }
        ],
        "mapping": [
          {
            "identity": "NFDI4Health",
            "map": "Design.nonInterventional.targetFollowUpDuration.frequency"
          }
        ]
      },
      {
        "id": "Extension.url",
        "path": "Extension.url",
        "fixedUri": "https://www.nfdi4health.de/fhir/metadataschema/StructureDefinition/nfdi4health-ex-mds-study-target-followup-duration"
      },
      {
        "id": "Extension.value[x]",
        "path": "Extension.value[x]",
        "max": "0"
      }
    ]
  }
}