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A StudyOID uniquely identifies a study. A SubjectKey uniquely identifies a subject within a study. SubjectKeys are not intended to be used to identify a subject across studies.
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A StudyEventOID uniquely identifies a StudyEventDef within a study. However there may be several study events of a particular type for a given subject. Thus, to fully identify a particular study event, we need the StudyOID, the SubjectKey, the StudyEventOID, and a StudyEventRepeatKey.
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