Positive Negative Unknown

{
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    }, {
      "system" : "http://terminology.hl7.org/CodeSystem/v3-NullFlavor",
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  "date" : "2009-01-29T00:10:00+11:00",
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  "name" : "PHVS_PosNegUnk_CDC",
  "resourceType" : "ValueSet",
  "title" : "Positive Negative Unknown",
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