http://hl7.org/fhir/StructureDefinition/cqf-qualityOfEvidence|5.2.0

The quality of the evidence described. The code system used specifies the quality scale used to grade this evidence source while the code specifies the actual quality score (represented as a coded value) associated with the evidence.
element_idtypes
Extension
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Extension.value[x]
Extension
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Extension.extension
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