http://hl7.org/fhir/undesirable-effect-frequency|5.0.0

{
  "description" : "A categorisation for a frequency of occurence of an undesirable effect.",
  "compose" : null,
  "package" : "hl7.fhir.r5.core@5.0.0",
  "date" : "2021-01-04T23:01:24Z",
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    "lastUpdated" : "2023-03-26T15:21:02.749+11:00"
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      "system" : "http://unstats.un.org/unsd/methods/m49/m49.htm",
      "display" : "World"
    } ]
  } ],
  "content" : "complete",
  "name" : "UndesirablEffectFrequency",
  "experimental" : false,
  "resourceType" : "CodeSystem",
  "title" : "Undesirabl Effect Frequency",
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    "valueCode" : "brr"
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    "valueInteger" : 1
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  "status" : "active",
  "id" : "0a8f5207-4145-5e26-a29c-b5b2933bfa5b",
  "valueSet" : "http://hl7.org/fhir/ValueSet/undesirable-effect-frequency",
  "url" : "http://hl7.org/fhir/undesirable-effect-frequency",
  "identifier" : [ {
    "value" : "urn:oid:2.16.840.1.113883.4.642.4.1995",
    "system" : "urn:ietf:rfc:3986"
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  "concept" : [ {
    "code" : "Common",
    "display" : "Common"
  }, {
    "code" : "Uncommon",
    "display" : "Uncommon"
  }, {
    "code" : "Rare",
    "display" : "Rare"
  } ],
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  "version" : "5.0.0",
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