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This section describes how the SDTM may be implemented to describe distinct types of relationships. relationships. Sets of variables used to represent relationships are detailed in the following sections. All relationships make use of the standard domain identifiers STUDYID, DOMAIN, and USUBJID.

When applicable In addition, the variables IDVAR and IDVARVAL are used for identifying represent variables and values which relate records by acting as record-level merge/join keys between datasets.

 The . These keys are used to tie information together by linking records. The specific set of identifiers necessary to properly identify each type of relationship is described in detail in the following sections. The following are examples of variables that could be used in IDVAR:

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