An example using the relatedArtifact element to quote text from the evidence source

{
  "resourceType" : "Evidence",
  "id" : "example-quoted-source",
  "extension" : [{
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
    "valueCode" : "cds"
  }],
  "title" : "Quoted Source: Prevalence of PASC at 30 days",
  "status" : "active",
  "publisher" : "HL7 International / Clinical Decision Support",
  "contact" : [{
    "telecom" : [{
      "system" : "url",
      "value" : "http://www.hl7.org/Special/committees/dss"
    }]
  }],
  "description" : "An example of using the relatedArtifact element to quote a line of text from the evidence source.",
  "variableDefinition" : [{
    "description" : "People with a history of COVID-19 who were not hospitalized (Arizona CoVHORT)",
    "variableRole" : "population"
  },
  {
    "description" : "Post-acute sequelae of COVID-19",
    "variableRole" : "outcome"
  }],
  "studyDesign" : [{
    "coding" : [{
      "system" : "https://fevir.net/sevco",
      "code" : "SEVCO:01002",
      "display" : "Observational research"
    },
    {
      "system" : "https://fevir.net/sevco",
      "code" : "SEVCO:01028",
      "display" : "Longitudinal data collection"
    }]
  }],
  "statistic" : [{
    "description" : "Prevalence 68.7% (95% Confidence interval 63.4% to 73.9%)",
    "statisticType" : {
      "coding" : [{
        "system" : "https://fevir.net/resources/CodeSystem/27270",
        "code" : "STATO:0000412",
        "display" : "prevalence"
      }]
    },
    "quantity" : {
      "value" : 68.7,
      "unit" : "%",
      "system" : "http://unitsofmeasure.org",
      "code" : "%"
    },
    "attributeEstimate" : [{
      "description" : "95% Confidence interval 63.4% to 73.9%",
      "type" : {
        "coding" : [{
          "system" : "https://fevir.net/resources/CodeSystem/27270",
          "code" : "TBD:0000059",
          "display" : "Confidence interval"
        }]
      },
      "level" : 0.95,
      "range" : {
        "low" : {
          "value" : 63.4,
          "unit" : "%",
          "system" : "http://unitsofmeasure.org",
          "code" : "%"
        },
        "high" : {
          "value" : 73.9,
          "unit" : "%",
          "system" : "http://unitsofmeasure.org",
          "code" : "%"
        }
      }
    }]
  }]
}