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Relationships between datasets are represented using a single record for each related dataset that identifies the key(s) of the dataset that can be used to relate the respective records. Relationships between datasets are specified using the key variables STUDYID, RDOMAIN, and IDVAR only. The values of variables USUBJID and IDVARVAL will be null as relationships between specific subject records will not be identified. The variable RELTYPE will identify the type of relationship between the datasets (e.g., a one-to-one or parent-child relationship). The allowable values for RELYPE RELTYPE
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