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The MarketAuthorizationHolder extension is used to capture the marketing authorization holder or manufacturer of the vaccine product.
This extension is designed to be used within the Immunization resource. It identifies the organization that holds the regulatory authorization to market the administered vaccine product.
Immunization.extension element.CodeableConcept.Description of Extensions, Differentials, Snapshots and how the different presentations work
http://ontariohealth.ca/fhir/ehr/StructureDefinition/ext-immunization-marketAuthorizationHolderCodeableConceptextensible).
https://fhir.infoway-inforoute.ca/ValueSet/immunizationmarketauthorizationholdercode