This is the CodeSystem that contains codes in both ResearchSubjectMilestone (http://terminology.hl7.org/CodeSystem/research-subject-milestone) and ResearchSubjectMilestone (http://terminology.hl7.org/CodeSystem/research-subject-milestone).
Generated Narrative: CodeSystem 64cb4fdc-5e7f-4e7b-ba95-487190526cd9-750
This code system http://hl7.org/fhir/comparison/CodeSystem/64cb4fdc-5e7f-4e7b-ba95-487190526cd9-750 defines codes, but no codes are represented here