|   ResearchStudy |  | 
 |     identifier | Organization's Unique Protocol ID; Secondary IDs | 
 |     title | Brief Title | 
 |     protocol | Interventions; Arm/Intervention Cross-Reference | 
 |     partOf |  | 
 |     status |  | 
 |     primaryPurposeType |  | 
 |     phase | Study Phase | 
 |     category | Study Type; Primary Purpose; Interventional Model; Masking; Allocation; study Classification; Observational Study Model; Time Perspective; Biospecimen Retention | 
 |     focus | Focus of Study | 
 |     condition | Conditions | 
 |     contact | Central Contact; Central Contact Backup; Overall Study Officials; Facility Contact & Backup (if Study tied to only one location); Investigators | 
 |     relatedArtifact | Citations, Links, Available Study Data/Documents | 
 |     keyword | Keywords | 
 |     location |  | 
 |     description | Detailed Description | 
 |     enrollment | Enrollment; Number of Groups/Cohorts (= number of "enrollment" instances); Groups (Group/Cohort Label = Group.name; Group/Cohort Description = Group.description); Eligibility (Group criteria) | 
 |     period | Study Start Date (start); Study Completion Date (end) | 
 |     sponsor | Sponsor | 
 |     principalInvestigator | Principal Investigator | 
 |     site | Facility | 
 |     reasonStopped | Why Study Stopped | 
 |     note |  | 
 |     arm | Arms | 
 |         name | Arm Label | 
 |         type | Arm Type | 
 |         description | Arm Description | 
 |     objective |  | 
 |         name |  | 
 |         type |  | 
 |   ResearchStudy | ObservationalStudyProtocolVersion; Study; 
StudyProtocolVersion | 
 |     identifier | No BRIDG mapping (although there is  DocumentVersion.identifier > StudyProtocolDocumentVersion, this is arguably a different semantic) | 
 |     title | No BRIDG mapping (although there is  StudyProtocolDocumentVersionPublicTitle this is arguably a different semantic: title of a document vs title of a research study) | 
 |     protocol | StudyProtocolDocumentVersionPublicTitle.name | 
 |     partOf | CompanionStudyRelationship | 
 |     status | StudyOverallStatus.code | 
 |     primaryPurposeType | StudyProtocolVersion.primaryPurposeTypeCode | 
 |     phase | StudyProtocolVersion.phaseCode | 
 |     category | InterventionalStudyProtocolVersion; InterventionalStudyProtocol.allocationCode; InterventionalStudyProtocol.blindedRoleCode; InterventionalStudyProtocol.blindingSchemaCode; InterventionalStudyProtocol.controlTypeCode | 
 |     focus | InterventionalStudyProtocol.interventionTypeCode | 
 |     condition | StudyCondition.code | 
 |     contact | PointOfContact > Project > Research Project > Study > StudyProtocol > StudyProtocolVersion | 
 |     relatedArtifact | StudyProtocolDocument, StudyProtocolDocumentVersion | 
 |     keyword | DocumentVersion.keywordCode; DocumentVersion.keywordText | 
 |     location | StudyProtocolVersion.participatingLocationCode | 
 |     description | StudyProtocolDocumentVersion.publicDescription | 
 |     enrollment | InterventionalStudyProtocol.interventionGroupQuantity | 
 |     period | ProjectConduct.dateRange; StudyProtocolVersion.plannedDuration | 
 |     sponsor | RegulatoryApplicationSponsor; StudyLegalSponsor; StudyProtocolVersion.responsiblePartyCode | 
 |     principalInvestigator | StudyInvestigator | 
 |     site | PlannedStudySite; StudySite | 
 |     reasonStopped | StudyOverallStatus.studyStoppedReasonCode | 
 |     note | No BRIDG mapping | 
 |     arm | Arm | 
 |         name | Arm.name | 
 |         type | Arm.typeCode | 
 |         description | Arm.description | 
 |     objective | StudyObjective | 
 |         name | No BRIDG mapping (BRIDG has a description, but not a name) | 
 |         type | StudyObjective.typeCode |