| Source Element | Usage | Target |
| ResearchStudy.id | UseElementSameName | ResearchStudy.id |
| ResearchStudy.meta | UseElementSameName | ResearchStudy.meta |
| ResearchStudy.implicitRules | UseElementSameName | ResearchStudy.implicitRules |
| ResearchStudy.language | UseElementSameName | ResearchStudy.language |
| ResearchStudy.text | UseElementSameName | ResearchStudy.text |
| ResearchStudy.contained | UseElementSameName | ResearchStudy.contained |
| ResearchStudy.extension | UseElementSameName | ResearchStudy.extension |
| ResearchStudy.modifierExtension | UseElementSameName | ResearchStudy.modifierExtension |
| ResearchStudy.identifier | UseElementSameName | ResearchStudy.identifier |
| ResearchStudy.title | UseElementSameName | ResearchStudy.title |
| ResearchStudy.protocol | UseElementSameName | ResearchStudy.protocol |
| ResearchStudy.partOf | UseElementSameName | ResearchStudy.partOf |
| ResearchStudy.status | UseExtension | http://hl7.org/fhir/4.3/StructureDefinition/extension-ResearchStudy.status |
| ResearchStudy.primaryPurposeType | UseElementSameName | ResearchStudy.primaryPurposeType |
| ResearchStudy.phase | UseElementSameName | ResearchStudy.phase |
| ResearchStudy.category | UseExtension | http://hl7.org/fhir/4.3/StructureDefinition/extension-ResearchStudy.category |
| ResearchStudy.focus | UseElementSameName | ResearchStudy.focus |
| ResearchStudy.condition | UseElementSameName | ResearchStudy.condition |
| ResearchStudy.contact | UseExtension | http://hl7.org/fhir/4.3/StructureDefinition/extension-ResearchStudy.contact |
| ResearchStudy.relatedArtifact | UseElementSameName | ResearchStudy.relatedArtifact |
| ResearchStudy.keyword | UseElementSameName | ResearchStudy.keyword |
| ResearchStudy.location | UseExtension | http://hl7.org/fhir/4.3/StructureDefinition/extension-ResearchStudy.location |
| ResearchStudy.description | UseElementSameName | ResearchStudy.description |
| ResearchStudy.enrollment | UseExtension | http://hl7.org/fhir/4.3/StructureDefinition/extension-ResearchStudy.enrollment |
| ResearchStudy.period | UseElementSameName | ResearchStudy.period |
| ResearchStudy.sponsor | UseExtension | http://hl7.org/fhir/4.3/StructureDefinition/extension-ResearchStudy.sponsor |
| ResearchStudy.principalInvestigator | UseExtension | http://hl7.org/fhir/4.3/StructureDefinition/extension-ResearchStudy.principalInvestigator |
| ResearchStudy.site | UseExtension | http://hl7.org/fhir/4.3/StructureDefinition/extension-ResearchStudy.site |
| ResearchStudy.reasonStopped | UseExtension | http://hl7.org/fhir/4.3/StructureDefinition/extension-ResearchStudy.reasonStopped |
| ResearchStudy.note | UseElementSameName | ResearchStudy.note |
| ResearchStudy.arm | UseExtension | http://hl7.org/fhir/4.3/StructureDefinition/extension-ResearchStudy.arm |
| ResearchStudy.arm.id | UseExtensionFromAncestor | - |
| ResearchStudy.arm.extension | UseExtensionFromAncestor | - |
| ResearchStudy.arm.modifierExtension | UseExtensionFromAncestor | - |
| ResearchStudy.arm.name | UseExtensionFromAncestor | - |
| ResearchStudy.arm.type | UseExtensionFromAncestor | - |
| ResearchStudy.arm.description | UseExtensionFromAncestor | - |
| ResearchStudy.objective | UseElementSameName | ResearchStudy.objective |
| ResearchStudy.objective.id | UseElementSameName | ResearchStudy.objective.id |
| ResearchStudy.objective.extension | UseElementSameName | ResearchStudy.objective.extension |
| ResearchStudy.objective.modifierExtension | UseElementSameName | ResearchStudy.objective.modifierExtension |
| ResearchStudy.objective.name | UseElementSameName | ResearchStudy.objective.name |
| ResearchStudy.objective.type | UseElementSameName | ResearchStudy.objective.type |