?:definition
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Specifies the link between a parent or master study and a companion or ancillary study. EXAMPLE(S): Embedded, Non-Stand-Alone Companion Non-Embedded, Non-Stand-Alone Companion Non-Embedded, Stand-Alone Companion OTHER NAME(S): NOTE(S): The relationship exists between the version of the parent study and the non-versioned concept of the companion study because the relationship may be added in a new version of the parent study and references the overall notion of the companion study, not a particular version of the companion study. Note that additional semantics about the companion study are captured in the StudyProtocolVersion.companionCode attribute.
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