?:definition
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Specifies whether the condition is considered part of the historical record of a subject, that is, it did not occur within the bounds of the study. Derived from comparing the occurrence date of the medical condition (PerformedMedicalConditionResult. occurrenceDateRange) with the subject participation in the study (PerformedStudySubjectMilestone. studyReferenceDateRange). If the occurrence date is within the study participation date range then this indicator will be \'true\'. Note that this means that this indicator will be derived differently for each study.
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