{
  "package" : "hl7.fhir.r5.core@5.0.0",
  "definition" : "A family study design in which twin siblings are compared.",
  "system" : "http://hl7.org/fhir/study-design",
  "property" : [ {
    "_uri" : "http://hl7.org/fhir/concept-properties#parent",
    "code" : "parent",
    "_implicit" : true,
    "valueCode" : "SEVCO:01020"
  } ],
  "codesystem" : "bb32c5f8-166a-5db4-919c-9554be080f5c",
  "concept_id" : "e6204d9b-ff9c-5fbd-9242-747c80ff8f2d",
  "ancestors" : {
    "SEVCO:01010" : 3,
    "SEVCO:01014" : 2,
    "SEVCO:01020" : 1,
    "SEVCO:01021" : 0
  },
  "id" : "2a976e29-18c4-4df0-8db2-bcae05270ddc",
  "code" : "SEVCO:01021",
  "display" : "Twin study design",
  "version" : "5.0.0"
}