Lookup for FHIR R3 Ratio for use in FHIR R5

Source ElementUsageTarget
Ratio.idUseElementSameNameRatio.id
Ratio.extensionUseElementSameNameRatio.extension
Ratio.numeratorUseElementSameNameRatio.numerator
Ratio.denominatorUseExtensionhttp://hl7.org/fhir/3.0/StructureDefinition/extension-Ratio.denominator