Positive Negative Unknown Not Done

{
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      "system" : "http://terminology.hl7.org/CodeSystem/v3-NullFlavor",
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  "date" : "2008-01-22T00:10:00+11:00",
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  "name" : "PHVS_PosNegUnkNotDone_CDC",
  "resourceType" : "ValueSet",
  "title" : "Positive Negative Unknown Not Done",
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