http://terminology.hl7.org/CodeSystem/study-type|4.0.1

{
  "description" : "Types of research studies (types of research methods).",
  "compose" : null,
  "package" : "hl7.fhir.r4.core@4.0.1",
  "date" : "2019-10-31T22:29:23Z",
  "meta" : {
    "lastUpdated" : "2019-11-01T09:29:23.356+11:00"
  },
  "publisher" : "HL7 (FHIR Project)",
  "content" : "complete",
  "name" : "StudyType",
  "experimental" : false,
  "resourceType" : "CodeSystem",
  "title" : "StudyType",
  "supliment" : null,
  "extension" : [ {
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
    "valueCode" : "cds"
  }, {
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
    "valueCode" : "trial-use"
  }, {
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
    "valueInteger" : 0
  } ],
  "status" : "draft",
  "id" : "ea20290d-51ad-5f9f-9bae-03810e134550",
  "valueSet" : "http://hl7.org/fhir/ValueSet/study-type",
  "url" : "http://terminology.hl7.org/CodeSystem/study-type",
  "identifier" : [ {
    "value" : "urn:oid:2.16.840.1.113883.4.642.4.1350",
    "system" : "urn:ietf:rfc:3986"
  } ],
  "concept" : [ {
    "code" : "RCT",
    "display" : "randomized trial",
    "definition" : "randomized controlled trial."
  }, {
    "code" : "CCT",
    "display" : "controlled trial (non-randomized)",
    "definition" : "controlled (but not randomized) trial."
  }, {
    "code" : "cohort",
    "display" : "comparative cohort study",
    "definition" : "observational study comparing cohorts."
  }, {
    "code" : "case-control",
    "display" : "case-control study",
    "definition" : "case-control study."
  }, {
    "code" : "series",
    "display" : "uncontrolled cohort or case series",
    "definition" : "uncontrolled cohort or case series."
  }, {
    "code" : "case-report",
    "display" : "case report",
    "definition" : "a single case report."
  }, {
    "code" : "mixed",
    "display" : "mixed methods",
    "definition" : "a combination of 1 or more types of studies."
  } ],
  "caseSensitive" : true,
  "version" : "4.0.1",
  "contact" : [ {
    "telecom" : [ {
      "value" : "http://hl7.org/fhir",
      "system" : "url"
    }, {
      "value" : "fhir@lists.hl7.org",
      "system" : "email"
    } ]
  } ]
}